Update protobuf in dev-requirements.txt (#485)

Addresses
https://github.com/aws-observability/aws-otel-python-instrumentation/security/dependabot/30

*Description of changes:*
- Version picked to what we use in other places:
https://github.com/aws-observability/aws-otel-python-instrumentation/blob/main/contract-tests/images/mock-collector/pyproject.toml#L16


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Author: srprash

dev-requirements.txt

@@ -8,10 +8,10 @@ pytest==7.1.3
 pytest-cov==4.1.0
 readme-renderer==42.0
 bleach==4.1.0 # transient dependency for readme-renderer
-protobuf~=3.13
+protobuf~=5.29.5
 markupsafe>=2.0.1
 codespell==2.1.0
 requests==2.32.4
 ruamel.yaml==0.17.21
 flaky==3.7.0
-botocore==1.34.67
+botocore==1.34.67