Bump protobuf from 3.12.2 to 4.25.8

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.12.2 to 4.25.8.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.12.2...v4.25.8)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 4.25.8
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -26,7 +26,7 @@ idna==2.10
 keyring==17.1.1
 keyrings.alt==3.1.1
 mock==4.0.2
-protobuf==3.12.2
+protobuf==4.25.8
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycrypto==2.6.1