.github/workflows: fix syntax

Change-Id: I5db08f6aedf95d9d32f6ffce7508f23febb41e11
Reviewed-on: https://review.monogon.dev/c/monogon/+/4426
Reviewed-by: Leopold Schabel <leo@monogon.tech>
Tested-by: Leopold Schabel <leo@monogon.tech>
diff --git a/.github/workflows/todo.yml b/.github/workflows/todo.yml
index a4ad30f..76f3814 100644
--- a/.github/workflows/todo.yml
+++ b/.github/workflows/todo.yml
@@ -19,4 +19,4 @@
         env:
           MANUAL_COMMIT_REF: ${{ inputs.MANUAL_COMMIT_REF }}
           MANUAL_BASE_REF: ${{ inputs.MANUAL_BASE_REF }}
-          INPUT_IGNORE: "MODULE\.bazel\.lock"
\ No newline at end of file
+          INPUT_IGNORE: "MODULE\\.bazel\\.lock"
\ No newline at end of file