chore(deps): bump the python group in /tests with 6 updates (nginx#6887)

Bumps the python group in /tests with 6 updates:

| Package | From | To |
| --- | --- | --- |
| [cryptography](https://github.com/pyca/cryptography) | `43.0.3` | `44.0.0` |
| [grpcio](https://github.com/grpc/grpc) | `1.68.0` | `1.68.1` |
| [grpcio-tools](https://github.com/grpc/grpc) | `1.68.0` | `1.68.1` |
| [protobuf](https://github.com/protocolbuffers/protobuf) | `5.28.3` | `5.29.0` |
| [pyopenssl](https://github.com/pyca/pyopenssl) | `24.2.1` | `24.3.0` |
| [pytest](https://github.com/pytest-dev/pytest) | `8.3.3` | `8.3.4` |


Updates `cryptography` from 43.0.3 to 44.0.0
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@43.0.3...44.0.0)

Updates `grpcio` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.68.0...v1.68.1)

Updates `grpcio-tools` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.68.0...v1.68.1)

Updates `protobuf` from 5.28.3 to 5.29.0
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v5.28.3...v5.29.0)

Updates `pyopenssl` from 24.2.1 to 24.3.0
- [Changelog](https://github.com/pyca/pyopenssl/blob/main/CHANGELOG.rst)
- [Commits](pyca/pyopenssl@24.2.1...24.3.0)

Updates `pytest` from 8.3.3 to 8.3.4
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.3.3...8.3.4)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: python
- dependency-name: grpcio
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python
- dependency-name: grpcio-tools
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python
- dependency-name: protobuf
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python
- dependency-name: pyopenssl
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Paul Abel <[email protected]>

Author: dependabot[bot]