v6.1.0

[v6.1.0]

Fixed

• Fixed Get-CosmosDbEntraIdToken to return the SecureString from
  the Get-AzAccessToken call rather than generating a new SecureString
  from the token property. This was resulting in a 401 Unauthorized error
  when calling any of the dataplane functions that used the Entra ID token -
  fixes Issue #511
• Fixed Convert-CosmosDbSecureStringToString to include process block so
  that pipelining works correctly.

Changed

• Changed Get-CosmosDbEntraIdToken so that if Get-AzAccessToken returns a
  null or empty token, it will throw an exception rather than returning a
  null or empty string.
• CHORE: Added .Devcontainer and Dependabot configuration files to the repository
  to support development in Visual Studio Code with a Docker container.
• CHORE: Updated Pull Request and Issue templates to use YAML forms in the
  .github/ISSUE_TEMPLATE folder.
• CHORE: Updated Az.Accounts to 5.0.0 or above requirements.psd1 and
  CosmosDB.psd1 - fixes Issue #509
• CHORE: Updated Az.Resources to 8.0.0 or above in requirements.psd1 and
  CosmosDB.psd1 - fixes Issue #509
• CHORE: Added copilot-instructions.md to control Copilot suggestions in the
  repository. This file is used to provide instructions to Copilot on how to
  generate code for the module.
• CHORE: Added prompts\create-spec.prompt.md to provide a prompt for creating
  new specifications for the module.
• CHORE: Added prompts\update-llms.yaml to provide a prompt for updating the
  llms.txt file for the repo.
• Removed testing on Ubuntu-20.04 from the CI pipeline because it is no longer
  supported by Microsoft managed Azure DevOps images.