Revert update dependabot.yml

Author: fhlavac

.github/dependabot.yml

@@ -7,7 +7,6 @@ updates:
       day: thursday
       time: "12:00"
       timezone: EST
-    workflow_dispatch:  # allow manual triggering
     versioning-strategy: increase
     allow:
       - dependency-type: "all"
@@ -28,7 +27,6 @@ updates:
       day: tuesday
       time: "12:00"
       timezone: EST
-    workflow_dispatch:  # allow manual triggering
     versioning-strategy: increase
     allow:
       - dependency-type: "all"