Remove explicit Bazel version from `presubmit.yml`

Copybara Import from https://github.com/bazelbuild/rules_java/pull/164

BEGIN_PUBLIC
Remove explicit Bazel version from `presubmit.yml` (#164)

The BCR should be free to set this version and now uses 7.0.0 by default, which matches the compatibility of this ruleset.

Closes #164
END_PUBLIC

COPYBARA_INTEGRATE_REVIEW=https://github.com/bazelbuild/rules_java/pull/164 from fmeum:patch-2 23a1ad38317ab240e70dabdb42166b01f2332c6c
PiperOrigin-RevId: 593061869
Change-Id: Ic978644d79a2a87c40d0ad1a0601d374b07e115f