[full-ci] chore: bump reva to v2.21.0

[micbar]

Description

Enhancement: Bump reva to v2.21.0

• Bugfix cs3org/reva#4740: Disallow reserved filenames
• Bugfix cs3org/reva#4748: Quotes in dav Content-Disposition header
• Bugfix cs3org/reva#4750: Validate a space path
• Enhancement cs3org/reva#4737: Add the backchannel logout event
• Enhancement cs3org/reva#4749: DAV error codes
• Enhancement cs3org/reva#4742: Expose disable-versioning configuration option
• Enhancement cs3org/reva#4739: Improve posixfs storage driver
• Enhancement cs3org/reva#4738: Add GetServiceUserToken() method to utils pkg

Related Issue

• Fixes <issue_link>

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[sonarcloud]

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 SonarCloud