fix: linting

Author: akselthomsen

.github/workflows/check_nn_versions.yaml

@@ -60,7 +60,7 @@ jobs:
       - name: Filter lock dates
         id: filter
         run: |
-          echo "jq --arg date "$MIN_LOCK_DATE" --compact-output '[.[] | select(.date >= $date)]' config.json" >> "$GITHUB_OUTPUT"
+          echo "jq --arg date $MIN_LOCK_DATE --compact-output '[.[] | select(.date >= $date)]' config.json" >> "$GITHUB_OUTPUT"
   R-CMD-check:
     needs: filter-nn-versions
     runs-on: '${{ matrix.os }}'