Support Bazel http_jar repository rule

[honnix]

Tell us more.

http_jar is pretty handy to reference an already built jar, and it seems to be reasonable for renovate to support.

As an example, bazel-diff is a well-known tool that is distributed primarily in this way: https://github.com/tinder/bazel-diff/#workspace-snippet

It seems to be possible to have a customized config to achieve this #30271, but it would be nice to have native support.

[github-actions[bot]]

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