ci: upgrade az cli version (#1195)

<!--- Provide a general summary of your changes in the Title above -->

## Description

New version of Bicep dropped, upgrading to latest azure cli to include
it.

<!--- Describe your changes in detail -->

## Related Issue(s)

- #{issue number}

## Verification

- [ ] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Updated Azure CLI version to 2.64.0 for improved deployment
capabilities.
  
- **Bug Fixes**
	- Enhanced performance and stability with the latest Azure CLI updates.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/action-deploy-apps.yml

@@ -1,6 +1,6 @@
 name: Deploy apps
 env:
-  AZ_CLI_VERSION: 2.61.0
+  AZ_CLI_VERSION: 2.64.0
 on:
   workflow_call:
     secrets:

.github/workflows/action-deploy-infra.yml

@@ -1,7 +1,7 @@
 name: Deploy infrastructure
 
 env:
-  AZ_CLI_VERSION: 2.61.0
+  AZ_CLI_VERSION: 2.64.0
 
 on:
   workflow_call: