Widen dependency constraints for better co-installability

[fivefilters]

Makes it easier to install readability.php into applications whose other dependencies pin different versions of our (transitive) dependencies, without changing the PHP minimum or the versions Composer installs by default.

What changed

• psr/log: ^2.0 || ^3.0 → ^1.0 || ^2.0 || ^3.0. The library only consumes LoggerInterface (a nullable constructor option and $logger?->debug() calls); it never implements it, so every major works. The anonymous logger in PhpFeaturesTest now uses an untyped log() signature that is valid against all three majors (the previous typed signature fatals under psr/log 1.x).
• rowbot/url: ^4.1 → ^3.1.7 || ^4.0. rowbot/url 4.1 hard-requires psr/log ^3.0 and brick/math ^0.12 || ^0.13 — both frequent conflict sources in host apps (e.g. older ramsey/uuid pins older brick/math, and the psr/log ^3 requirement made our own ^2.0 alternative unsatisfiable in practice). Allowing 4.0 and 3.1.7 gives Composer's solver room; nothing changes for apps without conflicts, since Composer still resolves to the newest allowed version.
• CI now runs the test suite against both highest and lowest resolved dependencies (composer update --prefer-lowest --prefer-stable) on PHP 8.4 and 8.5, so the advertised lower bounds stay tested. Psalm still runs on highest only.
• CHANGELOG: Unreleased entry describing the above.

Verification

Full suite (485 tests, 1080 assertions) plus Psalm run locally on PHP 8.4 (the version that actually exercises rowbot/url — 8.5+ uses native Uri\WhatWg\Url):

Resolution	rowbot/url	psr/log	brick/math	Result
highest	4.1.0	3.0.2	0.13.1	✅ all pass, Psalm clean
pinned	4.0.0	3.0.2	0.9.3	✅ all pass
pinned	3.1.7	3.0.2	0.9.3	✅ all pass, Psalm clean
--prefer-lowest	3.1.7	1.0.0	0.8.13	✅ all pass

Caveat worth deciding on

rowbot/url 3.1.7 emits 10 PHP 8.4 implicit-nullable deprecation notices from its own code when loaded (behavior is unaffected; all tests pass). Since it only loads on PHP 8.4 and only when another dependency forces the downgrade, I kept it in the constraint — maximum solver room. If you'd rather not advertise a version that emits deprecations, trimming to ^4.0 || ^4.1 still captures the brick/math flexibility and is a one-line change.

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