v12.16.0

• [12.x] Change priority in optimize:clear by @amirmohammadnajmi in #55792
• [12.x] Fix TestResponse::assertSessionMissing() when given an array of keys by @crynobone in #55800
• [12.x] Allowing Context Attribute to Interact with Hidden by @devajmeireles in #55799
• Add support for sending raw (non-encoded) attachments in Resend mail driver by @Roywcm in #55803
• [12.x] Added option to always defer for flexible cache by @Zwartpet in #55802
• [12.x] style: Use null coalescing assignment (??=) for cleaner code by @mohsenetm in #55823
• [12.x] Introducing Arr::hasAll by @devajmeireles in #55815
• [12.x] Restore lazy loading check by @decadence in #55817
• [12.x] Minor language update by @AhmedAlaa4611 in #55812
• fix(cache/redis): use connectionAwareSerialize in RedisStore::putMany() by @superbiche in #55814
• [12.x] Fix ResponseFactory should also accept null callback by @crynobone in #55833
• [12.x] Add template variables to scope by @wietsewarendorff in #55830
• [12.x] Introducing toUri to the Stringable Class by @devajmeireles in #55862
• [12.x] Remove remaining @return tags from constructors by @AhmedAlaa4611 in #55858
• [12.x] Replace alias is_integer() with is_int() to comply with Laravel Pint by @xurshudyan in #55851
• Fix argument types for Illuminate/Database/Query/Builder::upsert() by @jellisii in #55849
• [12.x] Add in_array_keys validation rule to check for presence of specified array keys by @stevebauman in #55807
• [12.x] Add Rule::contains by @stevebauman in #55809