protobuf: update external javadoc link (v1.52.x backport) #10192
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Backport of #9890 to v1.52.x.
Builds, both local and on GitHub, have been failing during protobuf javadoc generation with:
javadoc: error - Error fetching URL: https://developers.google.com/protocol-buffers/docs/reference/java/
Looks like this link now redirects to another place and that gradle can't follow that redirect.