build(deps): update protobuf requirement from 2.23.0 to 3.1.0

[dependabot[bot]]

Updates the requirements on protobuf to permit the latest version.

Changelog

Sourced from protobuf's changelog.

[3.1.0] - 2022-06-22

• Reflection API to clear fields

[3.0.3] - 2022-05-31

• optional fields in proto3 are now handled correctly in protoc-gen-rust plugin for protoc

[3.0.2] - 2022-05-06

• Sort modules in generated mod.rs

[3.0.1] - 2022-05-01

• More up to date readme.

[3.0.0] - 2022-05-01

• New stable version released.

Before version 3

Changelog before version 3

Commits

• c65c7d5 Bump version to 3.1.0
• 70cd66e Move clear_field reflection test
• 7f70813 Reflection clear_field tests
• d4aa230 Allow clearing field via reflection
• a9ca7ed Bump version to 3.1.0-pre
• 09c9c62 Bump version to 3.0.3
• 276a3cf set supported features (#626)
• 3585c2c Bump version to 3.0.2
• 6ff997e Fix generated mod.rs to pass cargo fmt -- --check
• 2bf4397 Erase changelog
• Additional commits viewable in compare view

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