chore(deps): update php docker tag to v8.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
php	final	minor	8.1-apache → 8.5-apache

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[holmboe]

Holding off on this one pending a PHP-compatibility check.

Concern: this jumps the local Phorge dev container from PHP 8.1 straight to 8.5, but Phorge's own compatibility tracking does not yet cover 8.5:

• Phorge's umbrella compatibility task T15064 is explicitly scoped to "Make Phorge compatible with PHP 8.1/8.2/8.3/8.4" — 8.5 is not listed, and the task is still open.
• PHP 8.5 only released on 2025-11-20 (php.net), so it is very new and unlikely to be validated against Phorge yet. Running Phorge on an untested PHP can surface Setup Issues/deprecation fatals and break make up.

Suggestion: bump to 8.4-apache instead of 8.5-apache:

• PHP 8.4 is within Phorge's tracked compatibility target (T15064) and is in upstream active support until 2026-12-31 (php.net).
• Staying on 8.1 isn't ideal either — PHP 8.1 is fully EOL (security support ended 2025-12-31) — so 8.4 is the sweet spot: supported upstream and covered by Phorge.

Recommend retargeting this to 8.4, or waiting until Phorge confirms 8.5 support, before merging. (Note: this only affects the local dev container, not anything shipped to users.)