Create bugfix template

.github/ISSUE_TEMPLATE/sweep-bugfix.yml

+name: Bugfix
+title: 'Sweep: '
+description: Write something like "We notice ... behavior when ... happens instead of ...""
+labels: sweep
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Details
+      description: More details about the bug
+      placeholder: The bug might be in ... file
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