Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@75bbf4fb Fix infinite loop for legacy wrapper (#13659)
PaperMC/Paper@c58f8443 Check for valid NamespacedKey in OldEnum#valueOf (#13596)
PaperMC/Paper@3f5728e2 Cleanup CLI args (#13646)
PaperMC/Paper@bd74bf65 feat: PlayerSwapWithEquipmentSlotEvent (#13687)
PaperMC/Paper@28f8027a 26.1
PaperMC/Paper@a0eb01aa Change world storage layout to be closer to vanilla & implement migration (#13736)
PaperMC/Paper@98012219 Implement new version schema: `<mcver>.build.<paper_build_no>-<paper_status>` / `<mcver>.local-SNAPSHOT`
PaperMC/Paper@79ad7f65 Update unpick definitions
PaperMC/Paper@5e9a9188 Lazy set Entity.projectileSource in AbstractProjectile#getShooter
PaperMC/Paper@9d2db142 Cache the climbing check in activation range (#12764)
PaperMC/Paper@7e34fba0 feat: Optimize ServerWaypointManager when locator bar is disabled
PaperMC/Paper@bc8f5928 Fix attack check
PaperMC/Paper@6a992682 Add PlayerToggleEntityAgeLockEvent (#13742)
PaperMC/Paper@870df9d3 [ci/skip] Drop stale TODO
PaperMC/Paper@8650896c handle legacy uid in vanilla migration and always write metadata during migration
PaperMC/Paper@7c923b72 [ci/skip] migrate remaining patches to jspecify
PaperMC/Paper@7773669d [ci/skip] Update README and CONTRIBUTING for 26.1 (#13739)

gradle.properties

@@ -3,7 +3,7 @@ group = org.purpurmc.purpur
 mcVersion = 26.1.1
 apiVersion = 26.1.1
 channel=EXPERIMENTAL
-paperCommit = 77c0866f5f60a74f475e94612a391b22df5cefe3
+paperCommit = 7773669d2ba9554e817b12c546ec58aa876d3bb4
 
 org.gradle.configuration-cache = true
 org.gradle.caching = true