chore(deps): bump google.golang.org/protobuf from 1.31.0 to 1.36.6 in /bookstore

[dependabot[bot]]

Bumps google.golang.org/protobuf from 1.31.0 to 1.36.6.

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Greptile Summary

Updates google.golang.org/protobuf dependency from v1.31.0 to v1.36.6 in the bookstore module, while also adding Go toolchain specification go1.24.1 for an existing Go 1.15 project.

• Significant version jump from v1.31.0 to v1.36.6 for protobuf dependency requires careful testing
• Added explicit Go toolchain version go1.24.1 which is much newer than project's Go 1.15 base version
• All previously implicit indirect dependencies are now explicitly listed in go.mod
• Dependabot compatibility score suggests this should be a safe upgrade despite version gap