Bump google.protobuf.version from 3.19.4 to 3.21.8 in /java

[dependabot]

Bumps google.protobuf.version from 3.19.4 to 3.21.8.
Updates protobuf-java from 3.19.4 to 3.21.8

Release notes

Sourced from protobuf-java'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

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

Protocol Buffers v3.20.0

2022-03-25 version 3.20.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)

Ruby

• Dropped Ruby 2.3 and 2.4 support for CI and releases. (#9311)
• Added Ruby 3.1 support for CI and releases (#9566).
• Message.decode/encode: Add recursion_limit option (#9218/#9486)
• Allocate with xrealloc()/xfree() so message allocation is visible to the Ruby GC. In certain tests this leads to much lower memory usage due to more frequent GC runs (#9586).
• Fix conversion of singleton classes in Ruby (#9342)

... (truncated)

Commits

• dab4d24 Update changelog
• 4d465ba Updating version.json and repo version numbers to: 21.8
• 3a0ae1d Merge pull request #10772 from deannagarcia/21.x
• dda7ffd Edit toolchain to work with absl dep
• 4aab0bf Merge pull request #10771 from protocolbuffers/gberg-cp-10770
• fa5a9e1 Auto capitalize enums name in Ruby (#10454) (#10763)
• 1594ac1 Merge pull request #10770 from protocolbuffers/googleberg-cl-480629524
• 5d90ef2 Merge pull request #10743 from brad0/21_openbsd_platform_macros
• 0ee5525 Upgrade kokoro to Xcode 14 (#10732)
• a971d06 21.x No longer define no_threadlocal on OpenBSD
• Additional commits viewable in compare view

Updates protobuf-java-util from 3.19.4 to 3.21.8

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