Bump protobuf from 3.9.1 to 3.9.2

Bumps protobuf from 3.9.1 to 3.9.2.

Release notes

*Sourced from [protobuf's releases](https://github.com/protocolbuffers/protobuf/releases).* > ## Protocol Buffers v3.9.2 > ## Objective-C > * Remove OSReadLittle* due to alignment requirements. ([#6678](https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/6678)) > * Don't use unions and instead use memcpy for the type swaps. ([#6672](https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/6672))

Commits

- [`52b2447`](https://github.com/protocolbuffers/protobuf/commit/52b2447247f535663ac1c292e088b4b27d2910ef) Update version to 3.9.2 ([#6682](https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/6682)) - [`cfee7d8`](https://github.com/protocolbuffers/protobuf/commit/cfee7d81911e361ee1eadf5ea638b402a5775252) Merge pull request [#6680](https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/6680) from thomasvl/objc_fix - [`a0eb83f`](https://github.com/protocolbuffers/protobuf/commit/a0eb83f5904757cc9690fec7867c04b8c2c95249) Remove OSReadLittle* due to alignment requirements ([#6678](https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/6678)) - [`42e0ff5`](https://github.com/protocolbuffers/protobuf/commit/42e0ff54859ac05751a8bbed0be859242a8a2bd7) [ObjC] Don't use unions and instead use memcpy for the type swaps. ([#6672](https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/6672)) - See full diff in [compare view](https://github.com/protocolbuffers/protobuf/compare/v3.9.1...v3.9.2)

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IceflowRE / unidown

Bump protobuf from 3.9.1 to 3.9.2 #150