fix: correct sphinx doctrees cache path

Author: JacobCoffee

.github/workflows/docs.yml

@@ -42,7 +42,7 @@ jobs:
       - name: Restore Sphinx build cache
         uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
         with:
-          path: _build/.doctrees
+          path: _build/html/.doctrees
           key: sphinx-doctrees-${{ github.sha }}
           restore-keys: |
             sphinx-doctrees-

.github/workflows/preview.yml

@@ -74,7 +74,7 @@ jobs:
         if: github.event.action != 'closed'
         uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
         with:
-          path: _build/.doctrees
+          path: _build/html/.doctrees
           key: sphinx-doctrees-preview-${{ github.event.pull_request.head.sha }}
           restore-keys: |
             sphinx-doctrees-preview-