Add installations-exp packages to changeset ignore (firebase#3745)

Author: hsubox76

.changeset/config.json

@@ -14,6 +14,8 @@
     "@firebase/app-types-exp",
     "@firebase/functions-exp",
     "@firebase/functions-types-exp",
+    "@firebase/installations-exp",
+    "@firebase/installations-types-exp",
     "@firebase/testing",
     "firebase-exp",
     "@firebase/app-compat",