[TASK] Bump the Symfony development dependencies

[oliverklee]

For development versions, we don't need to bother supporting lower versions of dependencies.

[coveralls]

Pull Request Test Coverage Report for Build 11071860891

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 11069449819:	0.0%
Covered Lines:	67
Relevant Lines:	67

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💛 - Coveralls

[oliverklee]

@DanielSiepmann @lukaszuznanski gentle ping for a review :-)

[DanielSiepmann]

@oliverklee approved if my question would be answered with no: Doesn't that prevent PHPStan, PHPUnit, etc. runs within CI against the lowest possible runtime dependencies, as require-dev constraints would raise the minimum version? And would you see this as an issue?

[oliverklee]

@DanielSiepmann Yes, this change has affects on which versions of those dependencies get installed when we install the lowest dependencies for unit and functional tests.

Those are development dependencies: We're not using them directly in production code (although the TYPO3 Core code might possibly call them), but (in this case) only in CI jobs like XLIFF and YAML linting. So I don't think raising the dependencies would be an issue in such a way that it would keep us from catching real problems.