fix(lambda): remove unused tag:UntagResources action from policy

Author: stuartp44

modules/runners/policies/lambda-scale-down.json

@@ -16,8 +16,7 @@
       "Action": [
         "ec2:TerminateInstances",
         "ec2:CreateTags",
-        "ec2:DeleteTags",
-        "tag:UntagResources"
+        "ec2:DeleteTags"
       ],
       "Resource": [
         "*"
@@ -33,8 +32,7 @@
       "Action": [
         "ec2:TerminateInstances",
         "ec2:CreateTags",
-        "ec2:DeleteTags",
-        "tag:UntagResources"
+        "ec2:DeleteTags"
       ],
       "Resource": [
         "*"