chore(deps): update ubuntu:focal docker digest to b650347

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	final	digest	ed4a422 -> b650347
ubuntu	stage	digest	ed4a422 -> b650347

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Configuration

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[github-actions]

license-eye has checked 49 files.

Valid	Invalid	Ignored	Fixed
0	21	28	0

Click to see the invalid file list

• actions.yaml
• charmcraft.yaml
• config.yaml
• generate-src-docs.sh
• mattermost.Dockerfile
• metadata.yaml
• pyproject.toml
• src/charm.py
• src/environment.py
• src/utils.py
• tests/conftest.py
• tests/integration/conftest.py
• tests/integration/localstack-installation.sh
• tests/integration/test_charm.py
• tests/integration/utils.py
• tests/unit/init.py
• tests/unit/test_charm.py
• tests/unit/test_environment.py
• tests/unit/test_helpers.py
• tests/unit/test_utils.py
• tox.ini

Use this command to fix any missing license headers

```bash

docker run -it --rm -v $(pwd):/github/workspace apache/skywalking-eyes header fix

</details>

[renovate]

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