Fix string interpolation from ${foo} to #{foo}

atomics/T1140/T1140.yaml

@@ -19,5 +19,5 @@ atomic_tests:
   executor:
     name: command_prompt
     command: |
-      certutil.exe -encode ${executable} file.txt
-      certutil.exe -decode file.txt ${executable}
+      certutil.exe -encode #{executable} file.txt
+      certutil.exe -decode file.txt #{executable}