chore: update dependency net.fabricmc:sponge-mixin to v0.17.3+mixin.0.8.7

Author: renovate[bot]

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ legacyLoom = "1.15.3"
 annotations = "26.0.2-1"
 fabricLoader = "0.18.4"
 cloudnet = "4.0.0-RC17-SNAPSHOT"
-fabricMixin = "0.17.0+mixin.0.8.7"
+fabricMixin = "0.17.3+mixin.0.8.7"
 
 [libraries]