Bump org.spongepowered:mixin from 0.8.5 to 0.8.7

Bumps [org.spongepowered:mixin](https://github.com/SpongePowered/Mixin) from 0.8.5 to 0.8.7.
- [Release notes](https://github.com/SpongePowered/Mixin/releases)
- [Commits](SpongePowered/Mixin@releases/0.8.5...releases/0.8.7)

---
updated-dependencies:
- dependency-name: org.spongepowered:mixin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -78,8 +78,8 @@ dependencies {
     compileOnly("cc.polyfrost:oneconfig-1.8.9-forge:0.2.1-alpha+")
     shadowImpl("cc.polyfrost:oneconfig-wrapper-launchwrapper:1.0.0-beta+")
 
-    compileOnly("org.spongepowered:mixin:0.8.5")
-    annotationProcessor("org.spongepowered:mixin:0.8.5")
+    compileOnly("org.spongepowered:mixin:0.8.7")
+    annotationProcessor("org.spongepowered:mixin:0.8.7")
 
     compileOnly("org.projectlombok:lombok:1.18.34")
     annotationProcessor("org.projectlombok:lombok:1.18.34")