chore(deps): bump prost from 0.12.3 to 0.12.4

[dependabot[bot]]

Bumps prost from 0.12.3 to 0.12.4.

Commits

• 38a00d8 chore: Release version 0.12.4 (#1024)
• b3de938 docs: Document feature flags (#1003)
• 12260d1 build(deps): Allow multimap 0.10 (#1013)
• 2b6140c build(deps): Allow heck 0.5 (#1012)
• 50bab4f chore: Split prost-types lib.rs into separate modules. (#1007)
• 0bd9482 Minor clippy lint fixes. (#1006)
• 82d7774 Allow itertools 0.12 (#948)
• 2a4aeaf feat: add derive feature (#992)
• e3d708c Improve protoc not found error message (#937)
• 145fd47 improve encode_varint performance by bounding its loop (#940)
• Additional commits viewable in compare view

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