Fix jsonnet parse error in bump-version.jsonnet (semgrep/semgrep-prop…

…rietary#2171)

This was not parsing with the jsonnet parser inside semgrep.

test plan:
./bin/osemgrep show dump-ast bump-version.jsonnet
now works

also run the workflow from this branch and it worked.
see
https://github.com/semgrep/semgrep-proprietary/actions/runs/10699902736
and semgrep/semgrep-proprietary#2172 created
(after I had to remove the previous bump-version-1.86.0 branch though
that was still
there from a previous run 2 weeks ago)

synced from Pro fb1cced5b15062c018d9ccbc69000c03c7fcc7cc

.github/workflows/libs/actions.libsonnet

@@ -117,6 +117,7 @@
     },
   },
 
+  // ??
   inc_version_steps: function(id='inc-version', fragment) [
     {
       uses: 'actions/checkout@v4',