Updated: protobuf-21.9-1

[Achim Gratz]

This is an update to the latest upstream security and bugfix release of
protobuf.

Protocol Buffers (a.k.a., protobuf) are Google's language-neutral,
platform-neutral, extensible mechanism for serializing structured data.


Note
====

This release is a security release and bumps the ABI versions, packages
that use protobuf should be re-released.

Upstream changed their version numbering scheme to omit the leading
"3." from their releases (the internal version number still uses the old
versioning scheme, though).

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