build(deps): Bump protobuf from 5.28.1 to 5.28.3 in /requirements

[dependabot[bot]]

Bumps protobuf from 5.28.1 to 5.28.3.

Commits

• 5fda5ab Updating version.json and repo version numbers to: 28.3
• fe30f9a Mute the minor version warning https://github.com/protocolbuffers/protobuf/is...
• d82fb47 Populate Kotlin Manifest Files (#18859)
• ce5174a Merge pull request #18798 from protocolbuffers/gberg-cp-28
• 3b62d78 Re-export includingDefaultValueFields in deprecated state for important Cloud...
• 3ea568a cherrypick restoration of mutableCopy helpers
• fe3bb07 Merge pull request #18616 from deannagarcia/28.x
• 664a7e1 Fix merge conflicts
• 63076f5 Merge pull request #18561 from protocolbuffers/28.x_no_vision_tests
• 22cd8ba [ObjC] Disabling visionOS on CI.
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.78%. Comparing base (e7e3989) to head (592bd80). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2545 +/- ## ========================================== + Coverage 88.75% 88.78% +0.02% ========================================== Files 168 168 Lines 11553 11553 ========================================== + Hits 10254 10257 +3 + Misses 1299 1296 -3 ```

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