Explicitly disable git pager in pre-commit

This is a copy of acts-project/acts#3928; long
story short, if git doesn't properly detect that it is not in a TTY, it
will hang pre-commit. Therefore, this explicitly disables paging.

.pre-commit-config.yaml

@@ -34,4 +34,4 @@ repos:
     - id: leftover_conflict_markers
       name: Leftover conflict markers
       language: system
-      entry: git diff --staged --check
+      entry: git --no-pager diff --staged --check