Bump net.minecraftforge.gradle:ForgeGradle from 5.1.+ to 6.0.5

Bumps net.minecraftforge.gradle:ForgeGradle from 5.1.+ to 6.0.5.

---
updated-dependencies:
- dependency-name: net.minecraftforge.gradle:ForgeGradle
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -12,7 +12,7 @@ buildscript {
 		mavenCentral()
 	}
 	dependencies {
-		classpath group: "net.minecraftforge.gradle", name: "ForgeGradle", version: "5.1.+", changing: true
+		classpath group: "net.minecraftforge.gradle", name: "ForgeGradle", version: "6.0.+", changing: true
 		classpath group: "org.parchmentmc", name: "librarian", version: "1.+", changing: true
 		classpath group: "info.u-team.gradle_files", name: "gradle_files", version: "1.2.2"
 		classpath group: "info.u-team.curse_gradle_uploader", name: "curse_gradle_uploader", version: "1.5.1"