build(deps): bump protobuf from 5.29.5 to 5.29.6 (open-telemetry#4897)

* build(deps): bump protobuf from 5.29.5 to 5.29.6

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.29.5 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
...

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

* Apply suggestion from @xrmx

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>

Author: dependabot[bot]

docs-requirements.txt

@@ -25,5 +25,5 @@ opentracing~=2.2.0
 thrift~=0.10
 wrapt>=1.0.0,<2.0.0
 markupsafe~=2.0
-protobuf==5.29.5
+protobuf==5.29.6
 prometheus-client~=0.22.1

opentelemetry-proto/test-requirements.latest.txt

@@ -18,7 +18,7 @@ packaging==25.0
     #   pytest
 pluggy==1.6.0
     # via pytest
-protobuf==6.31.1
+protobuf==6.33.5
     # via
     #   -r opentelemetry-proto/test-requirements.in
     #   opentelemetry-proto

opentelemetry-proto/test-requirements.oldest.txt

@@ -18,7 +18,7 @@ packaging==25.0
     #   pytest
 pluggy==1.6.0
     # via pytest
-protobuf==5.29.5
+protobuf==5.29.6
     # via
     #   -r opentelemetry-proto/test-requirements.in
     #   opentelemetry-proto