Pin spanner version, not just spanner bom

[damccorm]

Looks like #37305 didn't work and GoogleCloudPlatform/DataflowTemplates#3222 is still failing with the current change; I think its because the spanner version is still being pulled from the gcp bom.

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Summary of Changes

Hello @damccorm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where the google-cloud-spanner dependency was not being correctly versioned, leading to build failures in related projects. By explicitly pinning the version of the google-cloud-spanner library, this change ensures consistent and correct dependency resolution, resolving previous issues related to its version being implicitly managed by the Google Cloud Platform Bill of Materials (BOM).

Highlights

• Dependency Version Pinning: The google-cloud-spanner dependency is now explicitly pinned to a specific version ($google_cloud_spanner_version) instead of relying on the google_cloud_platform_libraries_bom to manage its version implicitly.
• Code Comment Update: The TODO comment related to removing pinned Spanner dependencies has been updated to include both google_cloud_spanner_bom and google_cloud_spanner, reflecting the new explicit pinning.

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[damccorm]

Its not clear to me why

beam/sdks/java/io/google-cloud-platform/build.gradle

Line 36 in c489cb7

exclude group: "com.google.cloud", module: "google-cloud-spanner"

doesn't just work here/why we're still picking up older versions of spanner...