Fix doctest

Author: Tristano8

.github/workflows/haskell-ci.yml

@@ -129,7 +129,7 @@ jobs:
       - name: cache (tools)
         uses: actions/cache/restore@v3
         with:
-          key: ${{ runner.os }}-${{ matrix.compiler }}-tools-a7a32ff6
+          key: ${{ runner.os }}-${{ matrix.compiler }}-tools-9c93c415
           path: ~/.haskell-ci-tools
       - name: install cabal-plan
         run: |
@@ -154,7 +154,7 @@ jobs:
         uses: actions/cache/save@v3
         if: always()
         with:
-          key: ${{ runner.os }}-${{ matrix.compiler }}-tools-a7a32ff6
+          key: ${{ runner.os }}-${{ matrix.compiler }}-tools-9c93c415
           path: ~/.haskell-ci-tools
       - name: checkout
         uses: actions/checkout@v3