Update protobuf requirement from ^2.17.0 to ^3.2.0

[dependabot[bot]]

Updates the requirements on protobuf to permit the latest version.

Changelog

Sourced from protobuf's changelog.

[3.2.0] - 2022-09-26

• Correctly specify log version
• Hash for SpecialFields

[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

• 7155092 Bump version to 3.2.0
• af0751d Select log version 0.4
• 2044851 Hash for SpecialFields
• 3737ede cargo fmt
• e6e5653 Bump version to 3.2.0-pre
• 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
• Additional commits viewable in compare view

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