Update validate-markdown.yaml

Author: ralfhandl

.github/workflows/validate-markdown.yaml

@@ -17,8 +17,6 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5 # checkout repo content
-        with:
-          fetch-depth: 0
 
       - uses: actions/setup-node@v5 # setup Node.js
         with:
@@ -28,7 +26,7 @@ jobs:
         run: npx --yes markdownlint-cli2 --config spec.markdownlint.yaml src/oas.md
 
       - name: Check links in work-in-progress spec
-        run: npx --yes linkspector check -c linkspector-config.yaml
+        run: npx --yes @umbrelladocs/linkspector check -c linkspector-config.yaml
 
       - name: Lint other files
         run: npx --yes markdownlint-cli2 *.md