Closes #6882 Update Action Scheduler to v3.8.1

[remyperona]

Description

Fixes #6882

Documentation

User documentation

Update Action Scheduler to v3.8.1

Technical documentation

Updated the Cleaner class to match with the changes in the parent class

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

New dependencies

• Action Scheduler 3.8.1

Checklists

Feature validation

• I validated all the Acceptance Criteria. If possible, provide sreenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.

Documentation

• I prepared the user documentation for the feature/enhancement and shared it in the PR or the GitHub issue.
• The user documentation covers new/changed entry points (endpoints, WP hooks, configuration files, ...).
• I prepared the technical documentation if needed, and shared it in the PR or the GitHub issue.

Code style

• I wrote self-explanatory code about what it does.
• I wrote comments to explain why it does it.
• I protected entry points against unexpected inputs.
• I did not introduce unecessary complexity.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 6c039041	❌ 20.18% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6c03904)	Report Missing	Report Missing	Report Missing
Head commit (9538ed3)	37566	9465	25.20%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6906)	436	88	20.18%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩

[Mai-Saad]

Related test plan https://wpmediaqa.testrail.io/index.php?/runs/view/891&group_by=cases:section_id&group_order=asc

[hanna-meda]

Thank you @Tabrisrp for this PR.
Thank you @jeawhanlee for helping with the testing.
Here are the test results:
testrail-report-636.pdf