Update proguard-base to 7.7.0

Author: foundweekends-bot[bot]

build.sbt

@@ -113,7 +113,7 @@ lazy val root = (project in file(".")).
       val old = (Compile / packageSrc / mappings).value
       old filter { case (_, p) => p != "META-INF/MANIFEST.MF" }
     },
-    Proguard / proguardVersion := "7.6.1",
+    Proguard / proguardVersion := "7.7.0",
     Proguard / proguardOptions ++= Seq(
       "-keep class conscript.* { *; }",
       "-keep class dispatch.* { *; }",