deps: Update dependency com.google.cloud:google-cloud-alloydb-bom to v0.19.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-alloydb-bom	0.18.0 -> 0.19.0

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Release Notes

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

v0.19.0: 0.19.0

Compare Source

Contrib

• Add Logback support for google-cloud-logging (#​2045)
• Make NIO retry more aggressive (#​2083)

BigQuery

• Expose null marker in load configuration (#​2073)
• Expose maximum billing tier in job configuration (#​2044)
• Expose labels in Dataset (#​1990)

Pub/Sub

• Add setCredentialsProvider to Publisher and Subscriber builders (#​2087, #​2088)
• Move polling task to system executor (#​2079)
• Make minor updates to documentation/samples (#​2074, #​2075, #​2078)

Translation

• Make minor updates to documentation/samples (#​2097, #​1782)

Spanner

• Make minor updates to documentation (#​2095)

Dependencies

• Bump version of google-auth-library to 0.7.0, including:
  • Retry HTTP failures in access token refresh for service account credentials (#​1545)
• Bump version of gax to 1.3.0, including:
  • Move credential provider up from channel provider to client settings (#​2034)

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