Update dependency protocolbuffers/protobuf to v28.3

This MR contains the following updates:

Package	Update	Change
protocolbuffers/protobuf	minor	28.2 -> 28.3

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Release Notes

protocolbuffers/protobuf (protocolbuffers/protobuf)

v28.3: Protocol Buffers v28.3

Compare Source

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Fix packed reflection handling bug in edition 2023. (#​18405) (https://github.com/protocolbuffers/protobuf/commit/c4124f9ec9185c6e9a9fdca4e41a00a1223ddca5)

Java

• Mute the minor version warning https://github.com/protocolbuffers/protobuf/issues/18096 (#​18923) (https://github.com/protocolbuffers/protobuf/commit/fe30f9a1d14e8f2b85987d4eed5c5594e6cf801f)
• Populate Kotlin Manifest Files (#​18859) (https://github.com/protocolbuffers/protobuf/commit/d82fb4710c08b763064c27dee3849af499641ffa)
• Re-export includingDefaultValueFields in deprecated state for important Cloud customer. (https://github.com/protocolbuffers/protobuf/commit/3b62d78dc70d2b43af5998d427452246279363c7)
• Cherrypick restoration of mutableCopy helpers (https://github.com/protocolbuffers/protobuf/commit/3ea568a9b6107ebf0d617c476f53a31490fd3182)
• Fix packed reflection handling bug in edition 2023. (#​18405) (https://github.com/protocolbuffers/protobuf/commit/c4124f9ec9185c6e9a9fdca4e41a00a1223ddca5)

Kotlin

• Populate Kotlin Manifest Files (#​18859) (https://github.com/protocolbuffers/protobuf/commit/d82fb4710c08b763064c27dee3849af499641ffa)

Python

• Mute the minor version warning https://github.com/protocolbuffers/protobuf/issues/18096 (#​18923) (https://github.com/protocolbuffers/protobuf/commit/fe30f9a1d14e8f2b85987d4eed5c5594e6cf801f)
• Fix packed reflection handling bug in edition 2023. (#​18405) (https://github.com/protocolbuffers/protobuf/commit/c4124f9ec9185c6e9a9fdca4e41a00a1223ddca5)

Other

• Fix merge conflicts (https://github.com/protocolbuffers/protobuf/commit/664a7e1cd37b6743126411d0af16990b92cde055)
• [ObjC] Disabling visionOS on CI. (https://github.com/protocolbuffers/protobuf/commit/22cd8ba0507488a6d73bea728c3fdf0e2594732f)
• Update staleness tests to only run over release branch (#​18398) (https://github.com/protocolbuffers/protobuf/commit/8e94b1493c5095c00bb7f4232558c3a4a7618228)

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