ISSUE_TEMPLATE/03_bug_report_nixos: remove git blame

This is annyoing advice. I am getting pinged for stuff that I have zero
interest in, just because I do treewides.

Changed files
+1 -1
.github
ISSUE_TEMPLATE
+1 -1
.github/ISSUE_TEMPLATE/03_bug_report_nixos.yml
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Please note that the maintainer attribute name does not always match the maintainer's GitHub username. If that occurs, try looking in [`maintainers/maintainer-list.nix`](https://github.com/NixOS/nixpkgs/blob/master/maintainers/maintainer-list.nix) for the maintainer attribute name, and checking if the maintainer has a listed GitHub username.
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If in doubt, check `git blame` for whoever last touched the module, or check the associated package's maintainers. Please add the mentions above the `---` characters.
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If in doubt, check the associated package's maintainers. Please add the mentions above the `---` characters.
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