chore(deps): bump protobuf from 5.28.3 to 5.29.6 (#256)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.28.3 to 5.29.6.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 5.29.6
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: bvolpato

requirements-unlocked.txt

@@ -5,7 +5,7 @@ ibis-framework
 ibis-substrait
 JPype1
 pandas
-protobuf==5.28.3
+protobuf==5.29.6
 pyarrow
 pytest
 pytest-csv

requirements.txt

@@ -15,7 +15,7 @@ packaging==24.2
 pandas==2.2.3
 parsy==2.1
 pluggy==1.5.0
-protobuf==5.28.3
+protobuf==5.29.6
 pyarrow==23.0.1
 pytest==8.3.3
 pytest-csv==3.0.0