add pep-723 inline metadata header to default bug report

[d-v-b]

I'm a huge fan of pep-723 inline metadata, but somehow I never remember its exact structure. it would be nice to pre-populate the bug report template with a header that works for zarr:

 # /// script
 # requires-python = ">=3.11"
 # dependencies = [
 #     "zarr",
 # ]
 # ///

[joshmoore]

This is a great idea. (I also never remember...)

I could additionally see starting with #!/usr/bin/env -S uv run