build: temporary disable branch manager (#14600)

Until Joey is back from vacation

Author: devversion

.github/branch-manager.yml

@@ -1,7 +1,9 @@
 enabled: true
 
 branches:
-  - branchName: 7.2.x
-    label: "target: patch"
-  - branchName: 7.x
-    label: "target: minor"
+  # Temporary disabled until https://github.com/angular/material2/issues/14582 is fixed, and the
+  # caretaker starts cherry-picking commits into the patch publish branch again.
+  # - branchName: 7.2.x
+  #   label: "target: patch"
+  # - branchName: 7.x
+  #   label: "target: minor"