Bump google-protobuf from 3.20.1 to 3.21.7

[dependabot[bot]]

Bumps google-protobuf from 3.20.1 to 3.21.7.

Release notes

Sourced from google-protobuf's releases.

Protocol Buffers v3.20.3

Java

• Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
• Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
• Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
• Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
• Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.
• This release addresses a Security Advisory for Java users

Protocol Buffers v3.20.2

C++

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

Commits

• 5fc03e1 Updating version.json and repo version numbers to: 21.7
• 24487dd Updating version.json and repo version numbers to: 21.6
• a44b4ae Updating version.json and repo version numbers to: 21.5
• c9869dc Updating version.json and repo version numbers to: 21.4
• b1eb126 Updating version.json and repo version numbers to: 21.3
• 839b18b Updating version.json and repo version numbers to: 21.2
• 38e3a11 Updating version.json and repo version numbers to: 21.1
• 59c6ff8 Updating version.json and repo version numbers to: 21.0
• 1fa42c4 Updating version.json and repo version numbers to: 21.0-rc2
• abe77ae Backport: Ruby: support x64-mingw-ucrt platform, which is the new platform wh...
• Additional commits viewable in compare view

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