Bump protobuf from 3.20.0 to 3.20.2 in /integration_tests

[dependabot[bot]]

Bumps protobuf from 3.20.0 to 3.20.2.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.20.2

C++

• Reduce memory consumption of MessageSet parsing
• This release addresses a Security Advisory for C++ and Python users

Protocol Buffers v3.20.1

PHP

• Fix building packaged PHP extension (#9727)
• Fixed composer.json to only advertise compatibility with PHP 7.0+. (#9819)

Ruby

• Disable the aarch64 build on macOS until it can be fixed. (#9816)

Other

• Fix versioning issues in 3.20.0

Protocol Buffers v3.20.1-rc1

#PHP

• Fix building packaged PHP extension (#9727)

#Other

• Fix versioning issues in 3.20.0

Commits

• a20c65f Updating changelog
• c49fe79 Updating version.json and repo version numbers to: 20.2
• 806d7e4 Merge pull request #10544 from deannagarcia/3.20.x
• ae718b3 Add missing includes
• b4c395a Apply patch
• 6439c5c Merge pull request #10531 from protocolbuffers/deannagarcia-patch-7
• 22c79e6 Update version.json
• c1a2d2e Fix python release on macos (#10512)
• a826282 Merge pull request #10505 from deannagarcia/3.20.x
• 7639a71 Add version file
• Additional commits viewable in compare view

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