Ensure correct requirements_dev.txt location in CI (#73)

Correct requirements_dev.txt file location.

To test the effectiveness, it was momentarily tested that
the CI job will run from `pull_request` events - which was
successful.

.github/workflows/ci_dependabot.yml

@@ -38,7 +38,7 @@ jobs:
           if [[ "${line}" =~ ^pre-commit.*$ ]]; then
             pre_commit="${line}"
           fi
-        done < requirements_dev.txt
+        done < dic2owl/requirements_dev.txt
 
         pip install ${pre_commit}