chore(bazel): [java-datacatalog] Update WORKSPACE files for rules_gapic, gax_java, generator_java versions

[lqiu96]

This is to resolve a diff that was discovered in #8448

[suztomo]

googleapis/java-datacatalog#795 was merged on May. This monorepo started late August. That PR 794 cannot be the cause of diff.

[lqiu96]

googleapis/java-datacatalog#795 was merged on May. This monorepo started late August. That PR 794 cannot be the cause of diff.

I don't think the diff was because of googleapis/java-datacatalog#795 -- It looks like the changes in java-datacatalog#795 was reverted

PR 8340 reverted the changes that went in googleapis/java-datacatalog#795: https://github.com/googleapis/google-cloud-java/pull/8340/files#diff-ebe3de62a47cce7750d33539cd0fec2f5169fe3d14c490b48bdd9c14a08a1b98

This is the diff PR #8340 created for DataCatalogSettings.java java-datacatalog:

This is what is in java-datacatalog now:

[suztomo]

@lqiu96 The java-datacatalog repository hasn't merged googleapis/java-datacatalog#857 (open).

[lqiu96]

I see. Ok, I'll leave java-datacatalog files as a known difference then. We'll have to wait for the person on support to merge that PR.

[suztomo]

I just merged googleapis/java-datacatalog#857