Update dependency voku/stringy to v7 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
voku/stringy (source)	~6.5.3 → ~7.0.0

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Release Notes

voku/Stringy (voku/stringy)

v7.0.0

Compare Source

• breaking-change: drop support for PHP 7.1
• fix "camelize()" + "upperCamelize()" for all-caps input such as "FOO BAR" and "API2URL"
• fix PHP 8.4 compatibility / deprecation warnings
• add proper return types and optimized nullable phpdocs for better PHP / PHPStan compatibility
• improve "collection()" handling for single strings, Stringy objects, and "null"; preserve keys in "CollectionStringy::createFromStrings()"
• improve edge-case handling for "appendRandomString()", "at()", "offsetGet()", "lineWrap()", "lineWrapAfterWord()", and truncation-related methods
• update vendor lib "voku/portable-utf8" to "~6.1.0"
• modernize GitHub Actions / PHPUnit configuration and add dependency automation via Dependabot + Renovate

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