bring v20.0.0 changelog to main (#3355)

.changelog/v20.0.0/dependencies/3304-bump-wasmd.md

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+- Bump [wasmd](https://github.com/CosmWasm/wasmd) to
+  [v0.53.0](https://github.com/CosmWasm/wasmd/releases/tag/v0.53.0)
+  ([\#3304](https://github.com/cosmos/gaia/pull/3304))

.changelog/v20.0.0/state-breaking/3304-bump-wasmd.md

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+- Bump [wasmd](https://github.com/CosmWasm/wasmd) to
+  [v0.53.0](https://github.com/CosmWasm/wasmd/releases/tag/v0.53.0)
+  ([\#3304](https://github.com/cosmos/gaia/pull/3304))

.changelog/v20.0.0/summary.md

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+*September 13, 2024*
+

CHANGELOG.md

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 # CHANGELOG
 
+## v20.0.0
+
+*September 13, 2024*
+
+### API BREAKING
+
+- Bump [ICS](https://github.com/cosmos/interchain-security) to
+  [v6.1.0](https://github.com/cosmos/interchain-security/releases/tag/v6.1.0).
+  This release of ICS introduces several API breaking changes. 
+  See the [ICS changelog](https://github.com/cosmos/interchain-security/blob/v6.1.0/CHANGELOG.md#api-breaking) for details.
+  ([\#3350](https://github.com/cosmos/gaia/pull/3350))
+
+### BUG FIXES
+
+- Migrate consensus params - initialize Version field
+  ([\#3333](https://github.com/cosmos/gaia/pull/3333))
+
+### DEPENDENCIES
+
+- Bump [wasmd](https://github.com/CosmWasm/wasmd) to
+  [v0.53.0](https://github.com/CosmWasm/wasmd/releases/tag/v0.53.0)
+  ([\#3304](https://github.com/cosmos/gaia/pull/3304))
+- Bump [feemarket](https://github.com/skip-mev/feemarket) to
+  [v1.1.1](https://github.com/skip-mev/feemarket/releases/tag/v1.1.1)
+  ([3306](https://github.com/cosmos/gaia/pull/3306))
+- Bump [ibc-go](https://github.com/cosmos/ibc-go) to
+    [v8.5.1](https://github.com/cosmos/ibc-go/releases/tag/v8.5.1)
+    ([\#3338](https://github.com/cosmos/gaia/pull/3338))
+- Bump [ICS](https://github.com/cosmos/interchain-security) to
+  [v6.1.0](https://github.com/cosmos/interchain-security/releases/tag/v6.1.0).
+  ([\#3350](https://github.com/cosmos/gaia/pull/3350))
+
+### FEATURES
+
+- Set the `MaxProviderConsensusValidators` parameter of the provider module to 180. 
+  This parameter will be used to govern the number of validators participating in consensus,
+  and takes over this role from the `MaxValidators` parameter of the staking module.
+  ([\#3263](https://github.com/cosmos/gaia/pull/3263))
+- Set the `MaxValidators` parameter of the staking module to 200, which is the current number of 180 plus 20.
+  This is done as a result of introducing the inactive-validators feature of Interchain Security, 
+  which entails that the number of validators participating in consensus will be governed by the 
+  `MaxProviderConsensusValidators` parameter in the provider module.
+  ([\#3263](https://github.com/cosmos/gaia/pull/3263))
+- Set the metadata for launched ICS consumer chains.
+  ([\#3308](https://github.com/cosmos/gaia/pull/3308))
+- Migrate active ICS gov proposal to the new messages
+  introduced by the permissionless ICS feature.
+  ([\#3316](https://github.com/cosmos/gaia/pull/3316))
+- Bump [ICS](https://github.com/cosmos/interchain-security) to
+  [v6.1.0](https://github.com/cosmos/interchain-security/releases/tag/v6.1.0).
+  This release of ICS enables the permissionless creation of consumer chains 
+  and allows validators outside the active validator set to opt in to validate 
+  on consumer chains.
+  ([\#3350](https://github.com/cosmos/gaia/pull/3350))
+
+### STATE BREAKING
+
+- Set the `MaxProviderConsensusValidators` parameter of the provider module to 180. 
+  This parameter will be used to govern the number of validators participating in consensus,
+  and takes over this role from the `MaxValidators` parameter of the staking module.
+  ([\#3263](https://github.com/cosmos/gaia/pull/3263))
+- Set the `MaxValidators` parameter of the staking module to 200, which is the current number of 180 plus 20.
+  This is done as a result of introducing the inactive-validators feature of Interchain Security, 
+  which entails that the number of validators participating in consensus will be governed by the 
+  `MaxProviderConsensusValidators` parameter in the provider module.
+  ([\#3263](https://github.com/cosmos/gaia/pull/3263))
+- Bump [wasmd](https://github.com/CosmWasm/wasmd) to
+  [v0.53.0](https://github.com/CosmWasm/wasmd/releases/tag/v0.53.0)
+  ([\#3304](https://github.com/cosmos/gaia/pull/3304))
+- Bump [ibc-go](https://github.com/cosmos/ibc-go) to
+    [v8.5.0](https://github.com/cosmos/ibc-go/releases/tag/v8.5.0)
+    ([\#3305](https://github.com/cosmos/gaia/pull/3305))
+- Set the metadata for launched ICS consumer chains.
+  ([\#3308](https://github.com/cosmos/gaia/pull/3308))
+- Migrate active ICS gov proposal to the new messages
+  introduced by the permissionless ICS feature.
+  ([\#3316](https://github.com/cosmos/gaia/pull/3316))
+- Bump [ICS](https://github.com/cosmos/interchain-security) to
+  [v6.1.0](https://github.com/cosmos/interchain-security/releases/tag/v6.1.0).
+  ([\#3350](https://github.com/cosmos/gaia/pull/3350))
+
 ## v19.2.0
 
 *September 04, 2024*