Clean up calls to .encode() / .decode()

testing/resources/arbitrary_bytes_repo/hook.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # Intentionally write mixed encoding to the output.  This should not crash
 # pre-commit and should write bytes to the output.
-# '☃'.encode('UTF-8') + '²'.encode('latin1')
+# '☃'.encode() + '²'.encode('latin1')
 echo -e '\xe2\x98\x83\xb2'
 # exit 1 to trigger printing
 exit 1