Disable spotbugs check that fails on Mac OS in CI

[skarsaune]

---

Progress

• Commit message must refer to an issue
• Change must be properly reviewed (1 review required, with at least 1 Committer)

Error

 ⚠️ The pull request body must not be empty.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jmc.git pull/603/head:pull/603
$ git checkout pull/603

Update a local copy of the PR:
$ git checkout pull/603
$ git pull https://git.openjdk.org/jmc.git pull/603/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 603

View PR using the GUI difftool:
$ git pr show -t 603

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jmc/pull/603.diff

[bridgekeeper]

👋 Welcome back skarsaune! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[skarsaune]

Covered by the comment just above.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[thegreystone]

I think this was fixed by #598. At least the CI runs were fine in that PR and in subsequent PRs, e.g. #599.