chore: update googleapis commitish to 3f9c9d7

[cloud-java-bot]

Updated googleapis commitish in librarian.yaml to googleapis/googleapis@3f9c9d7

💡 Note: If this PR is still open when the daily update workflow runs next, it will be closed and replaced with a new PR containing the latest updates.

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• java-chat/samples/snippets/generated/com/google/chat/v1/chatservice/searchmessages/AsyncSearchMessages.java:19, tag chat_v1_generated_ChatService_SearchMessages_async
• java-chat/samples/snippets/generated/com/google/chat/v1/chatservice/searchmessages/AsyncSearchMessagesPaged.java:19, tag chat_v1_generated_ChatService_SearchMessages_Paged_async
• java-chat/samples/snippets/generated/com/google/chat/v1/chatservice/searchmessages/SyncSearchMessages.java:19, tag chat_v1_generated_ChatService_SearchMessages_sync
• java-chat/samples/snippets/generated/com/google/chat/v1/chatservice/searchmessages/SyncSearchMessagesSpacenameString.java:19, tag chat_v1_generated_ChatService_SearchMessages_SpacenameString_sync
• java-chat/samples/snippets/generated/com/google/chat/v1/chatservice/searchmessages/SyncSearchMessagesStringString.java:19, tag chat_v1_generated_ChatService_SearchMessages_StringString_sync
• java-datamanager/samples/snippets/generated/com/google/ads/datamanager/v1/ingestionservice/removeallaudiencemembers/AsyncRemoveAllAudienceMembers.java:19, tag datamanager_v1_generated_IngestionService_RemoveAllAudienceMembers_async
• java-datamanager/samples/snippets/generated/com/google/ads/datamanager/v1/ingestionservice/removeallaudiencemembers/SyncRemoveAllAudienceMembers.java:19, tag datamanager_v1_generated_IngestionService_RemoveAllAudienceMembers_sync

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[gemini-code-assist]

Code Review

This pull request updates dependency versions across multiple Google Cloud Java client libraries, bumping the BOM version to 26.86.0 and updating individual library versions in their respective README files. It also introduces the SearchMessages API to the Google Chat client library (java-chat), adding the corresponding client methods, stubs, proto definitions, tests, and code samples. Additionally, it updates the Dataform client library (java-dataform) to support repository snapshots in Google Cloud Storage, adding PipelineConfig, GcsRepositorySnapshotDestination, and GcsRepositorySnapshotMetadata configurations to compilation results, notebook runtime options, and workflow invocations. There are no review comments provided, so I have no feedback to offer on the changes.