Fixes #7042 Argument 2 ($url) passed to exclude_rocket_from_wp_updates() must be of the type string

[Khadreal]

Description

Fixes #7042
Fixed error for some users when updating from one version to another.

Type of change

• Bug fix (non-breaking change which fixes an issue).

Detailed scenario

Check #7042

Technical description

Revert the phpstan update on the method.

Documentation

Mandatory Checklist

Code validation

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

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for c2e65f01	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c2e65f0)	Report Missing	Report Missing	Report Missing
Head commit (37e9f6c)	0	0	0.00%

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 (#7059)	0	0	∅ (not applicable)

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

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[Mai-Saad]

For test: reproduce the issue and confirm it's fixed is enough. Please check this for reproducing it https://wp-media.slack.com/archives/CUT7FLHF1/p1730103718060409?thread_ts=1730101320.378249&cid=CUT7FLHF1

[hanna-meda]

Thank you, @Khadreal, for this PR.
Reproduced error outside the PR by using snippet from thread. On PR this error no longer happens (just some deprecation notices because of snippet but confirmed with devs that those are expected in this situation, and a very edgy one).
Confirming this as fixed on test env.