[BEAM-9615] Rollback to prior version of protobuf to fix :sdks:go:buildLinuxAmd64

[lukecwik]

Fixes issue caused by #12554

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Post-Commit Tests Status (on master branch)

Lang	SDK	Dataflow	Flink	Samza	Spark	Twister2
Go		---		---		---
Java
Python				---		---
XLang		---		---		---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

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[lukecwik]

R: @lostluck

[lukecwik]

Didn't work. Trying something else.

[lostluck]

Yeah it wouldn't have worked. The version needed bumping so the test could work in the first place.