Update guzzlehttp/psr7 requirement from ~2.7.1 to ~2.8.0 in the production-dependencies group #369

Job	Run time
Security checks	22s
Quality control	19s
Linter / yaml-linter	6s
PHP-Linter (8.1) / linter	15s
Linter / json-linter	23s
PHP-Linter (8.2) / linter	12s
PHP-Linter (8.3) / linter	18s
PHP-Linter (8.4) / linter	12s
Linter / ecmascript-linter	-1s
Linter / style-linter	-1s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Code coverage	0s
Cleanup artifacts	0s
	2m 5s

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