Update node in GH workflows

[angrykoala]

• Remove cla-assistant, it is not used
• Update workflows to use node 20

[changeset-bot]

⚠️ No Changeset found

Latest commit: 98a4e91

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud