Update .pre-commit-hooks.yaml

`files` takes a regex (https://pre-commit.com/#hooks-files), see [pyproject-fmt](https://github.com/tox-dev/pyproject-fmt/blob/e98095a8ec63852aaf72683ee694e97986a2b48e/.pre-commit-hooks.yaml) for an example

Author: GideonBear

.pre-commit-hooks.yaml

@@ -2,12 +2,12 @@
   name: Check supported Python EOL
   entry: checkeol
   language: python
-  files: '^pyproject.toml$'
+  files: '^pyproject\.toml$'
   types: [toml]
 
 - id: check-eol-cached
   name: Check supported Python EOL (cache only)
   entry: checkeol --cache_only
   language: python
-  files: '^pyproject.toml$'
+  files: '^pyproject\.toml$'
   types: [toml]