Bump protobuf from 3.18.1 to 3.18.3 in /scripts

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.18.1 to 3.18.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.18.1...v3.18.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

scripts/requirements.txt

@@ -17,7 +17,7 @@ hurry.filesize==0.9
 idna==3.3
 packaging==21.0
 proto-plus==1.19.5
-protobuf==3.18.1
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pyparsing==2.4.7