fix indentation in heredoc

Author: ianbotsf

.github/actions/emit-metrics/action.yml

@@ -66,11 +66,12 @@ runs:
         }
 
         RAW_DIMENSIONS=$(cat << END_OF_DIMENSIONS
-          ${{ inputs.dimensions }}
-          END_OF_DIMENSIONS )
+        ${{ inputs.dimensions }}
+        END_OF_DIMENSIONS)
+
         RAW_METRICS=$(cat << END_OF_METRICS
-          ${{ inputs.metrics }}
-          END_OF_METRICS )
+        ${{ inputs.metrics }}
+        END_OF_METRICS)
 
         NAMESPACE="--namespace \"${{ inputs.namespace }}\""
         DIMENSIONS="$(format "--dimension" "$RAW_DIMENSIONS")"