[ci skip] Use commit timestamp instead of build time in manifest (#6161)

patches/server/Add-git-branch-and-commit-to-manifest.patch

@@ -9,9 +9,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -0,0 +0,0 @@ tasks.jar {
-         val git = Git(rootProject.layout.projectDirectory.path)
          val gitHash = git("rev-parse", "--short=7", "HEAD").getText().trim()
          val implementationVersion = System.getenv("BUILD_NUMBER") ?: "\"$gitHash\""
+         val date = git("show", "-s", "--format=%ci", gitHash).getText().trim() // Paper
 +        val gitBranch = git("rev-parse", "--abbrev-ref", "HEAD").getText().trim() // Paper
          attributes(
              "Main-Class" to "org.bukkit.craftbukkit.Main",