Amend release notes to make it clear that bzlmod support is only for Bazel 7+

[vreuter]

What happened?

7a71042 introduces use_repo_rule, which was introduced in Bazel 7. In our case, bumping rules_nodejs from 6.3.0 to 6.7.5 therefore breaks compatibility with Bazel 6, even though Bazel 6 compatibility is claimed in recent release notes. Is there some workaround which was envisioned, and/or is this a known issue?

Version

• rules_nodejs version 6.7.5
• Bazel version 6.6

How to reproduce

# MODULE.bazel
bazel_dep(name = "rules_nodejs", version = "6.7.5")

Any other information?

No response

[vreuter]

Based on discussion / decisions in bazel-contrib/rules_jvm_external#1151 and bazel-contrib/rules_jvm_external#1055, it appears that this is a known issue. The release notes should communicate this, though, with something like "If you are using Bazel 7 or above" for the bzlmod section, as in the release notes for rules_jvm_external. In particular, maybe it should be noted at which point in the release history that support was dropped for bzlmod on Bazel < 7, which appears to be with the 6.7.x line.