Bump protobuf from 4.21.1 to 4.21.6

[dependabot]

Bumps protobuf from 4.21.1 to 4.21.6.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.0.0-beta-4

Version 3.0.0-beta-4

General

• Added a deterministic serialization API for C++. The deterministic serialization guarantees that given a binary, equal messages will be serialized to the same bytes. This allows applications like MapReduce to group equal messages based on the serialized bytes. The deterministic serialization is, however, NOT canonical across languages; it is also unstable across different builds with schema changes due to unknown fields. Users who need canonical serialization, e.g. persistent storage in a canonical form, fingerprinting, etc, should define their own canonicalization specification and implement the serializer using reflection APIs rather than relying on this API.

• Added OneofOptions. You can now define custom options for oneof groups.

  import "google/protobuf/descriptor.proto";
  extend google.protobuf.OneofOptions {
    optional int32 my_oneof_extension = 12345;
  }
  message Foo {
    oneof oneof_group {
      (my_oneof_extension) = 54321;
      ...
    }
  }
  

C++ (beta)

• Introduced a deterministic serialization API in CodedOutputStream::SetSerializationDeterministic(bool). See the notes about deterministic serialization in the General section.
• Added google::protobuf::Map::swap() to swap two map fields.
• Fixed a memory leak when calling Reflection::ReleaseMessage() on a message allocated on arena.
• Improved error reporting when parsing text format protos.
• JSON
  • Added a new parser option to ignore unknown fields when parsing JSON.
  • Added convenient methods for message to/from JSON conversion.
• Various performance optimizations.

Java (beta)

• File option "java_generate_equals_and_hash" is now deprecated. equals() and hashCode() methods are generated by default.
• Added a new JSON printer option "omittingInsignificantWhitespace" to produce a more compact JSON output. The printer will pretty-print by default.
• Updated Java runtime to be compatible with 2.5.0/2.6.1 generated protos.

Python (beta)

... (truncated)

Commits

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