Bump protobuf from 3.6.1 to 5.29.6

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.6.1 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>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.18.2
-protobuf==3.6.1
+protobuf==5.29.6
 pandas==1.0.3
 xlrd==1.1.0
 boxcars-py==0.1.*

setup.py

@@ -47,7 +47,7 @@ def run(self):
     version=version_string,
     packages=setuptools.find_packages(),
     include_package_data=True,
-    install_requires=['pandas==1.0.3', 'protobuf==3.6.1', 'xlrd==1.1.0', 'numpy==1.18.2', 'boxcars-py==0.1.*'],
+    install_requires=['pandas==1.0.3', 'protobuf==5.29.6', 'xlrd==1.1.0', 'numpy==1.18.2', 'boxcars-py==0.1.*'],
     url='https://github.com/SaltieRL/carball',
     keywords=['rocket-league'],
     license='Apache 2.0',