Update dependency mediawiki/mediawiki-phan-config to v0.12.0

This MR contains the following updates:

Package	Type	Update	Change
mediawiki/mediawiki-phan-config (source)	require-dev	minor	0.11.1 -> 0.12.0

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Release Notes

wikimedia/mediawiki-phan-config

v0.12.0

Compare Source

• Avoid PhanRedefinedInheritedInterface by excluding symfony/polyfill-php80 (Umherirrender)
• Bump minimum PHP version to 7.4 (C. Scott Ananian)
• Disable PhanPluginDuplicateExpressionAssignmentOperation (Reedy)
• Bump phan to 5.4.1 and taint-check to 4.0.0 (Daimona Eaytoy)

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