[ray] fix executable cls

[richardliaw]

Checklist before submitting

• Did you read the contributor guide?
• Did you update the docs?
• Did you write any tests to validate this change?
• Did you update the CHANGELOG, if this change affects users?

Description

Executable class for Ray wasn't working properly (needed for ludwig).

Review process to land

1. All tests and other checks must succeed.
2. At least one member of the technical steering committee must review and approve.
3. If any member of the technical steering committee requests changes, they must be addressed.

[tgaddair]

LGTM! Thanks for the fix.

[richardliaw]

Hmm, looks like the test failed on something unrelated?

[tgaddair]

Hmm, looks like the test failed on something unrelated?

Rerunning the test.

[github-actions]

Unit Test Results

   483 files  +  18     483 suites  +18   4h 10m 13s ⏱️ + 5m 32s
   534 tests +    1     503 ✔️  -     1       29 💤 ±    0  2 ❌ +2 
9 751 runs  +353  7 752 ✔️ +235  1 997 💤 +116  2 ❌ +2 

For more details on these failures, see this check.

Results for commit d8bd986. ± Comparison against base commit 2fdea15.