deps: Update alloydb BOM & shared dependencies

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-alloydb-bom	0.19.0 -> 0.20.0
com.google.cloud:google-cloud-shared-dependencies	3.19.0 -> 3.20.0

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Release Notes

googleapis/google-cloud-java (com.google.cloud:google-cloud-alloydb-bom)

v0.20.0: 0.20.0

Compare Source

BigQuery

• Convert all BigQuery deserialized enum types to StringEnumValue (#​2128) minor breaking change

Compute

• Convert all Compute deserialized enum types to StringEnumValue (#​2136) minor breaking change

DNS

• Convert all DNS deserialized enum types to StringEnumValue (#​2137) minor breaking change

Logging

• Logging logback appender : Class loader fix for custom enhancers (#​2130)

Pub/Sub (Now beta!)

• pubsub: make poll wait for messages (#​2112)
• make Subscriber.stopAsync actually stop pulling more messages (#​2113)
• remove Publisher's flow-control (#​2102) breaking change
  • We feel that our design could use improvement, and we'd rather remove it now, early on, rather than have many clients depend on a flawed client surface.
• pubsub: start subscriber connections quickly again (#​2104)
• Switching PubSub from alpha to beta (#​2121)

Resource Manager

• Convert all Resource Manager deserialized enum types to StringEnumValue (#​2138) minor breaking change

Storage

• Add getter docs for service objects (#​2129)

Spanner

• Cloud Spanner: Make Spanner value classes serializable (#​2040)

All auto-generated clients

• regenerate from toolkit (#​2116)
  • This moves credentials to the root settings level instead of living inside channel settings
• Removing .spi from generated package names (#​2135) widespread breaking change

Tests

• fix wrong logging filter format, which causes 502 error (#​2145)

Internal

• Update release instructions and scripts (#​2120)
• verify.sh: make verify more debug-friendly (#​2133)
• update_version.sh: make maven run in batch mode (#​2132)

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