chore: add a couple of direnv specific files to the gitignore (#8165)

# Description

Hi, I would like to add a couple of things to the `.gitignore` that
would probably not be preferred to be checked out.

Thanks in advance! :) 

# User-Facing Changes

- none

# Tests + Formatting

- not affected

# After Submitting

- not affected

.gitignore

@@ -38,4 +38,11 @@ tarpaulin-report.html
 .vs/*
 *.rsproj
 *.rsproj.user
-*.sln
+*.sln
+
+# direnv
+.direnv/
+.envrc
+
+# pre-commit-hooks
+.pre-commit-config.yaml