Support Laravel 13

[jbrooksuk]

Adds Laravel 13 support alongside the existing Laravel 11 and 12 support.

Changes

composer.json

• illuminate/* (cache, console, database, events, queue, support): allow ^13.0
• orchestra/testbench: allow ^11.0 (targets Laravel 13)
• dedoc/scramble: ^0.12 → ^0.12|^0.13 — ^0.12 caps at Laravel 12; ^0.13 adds illuminate/contracts ^13.0, the only real blocker

.github/workflows/run-tests.yml

• Add 13.x to the test + static-analysis matrices across all jobs

Verification

• composer update -W --with=illuminate/support:^13.0 resolves cleanly (installs laravel/framework v13.18.0, testbench 11, scramble 0.13, Symfony 8, tinker 3)
• Full Pest suite passes on Laravel 13.18 — 0 failures (2438 assertions)
• composer validate and Pint lint both pass

Notes:

• PHP matrix [8.4, 8.3] is unchanged and already satisfies Laravel 13's 8.3 minimum.
• nesbot/carbon already allowed ^3.0, so no Carbon change was needed.
• No application code changes were required — the suite is green as-is.

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