add lychee token

Author: hugsy

.github/workflows/validate-docs.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Check links
         uses: lycheeverse/lychee-action@v1.6.1
         env:
-          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          GITHUB_TOKEN: ${{secrets.LYCHEE_TOKEN}}
         with:
           args: --cache --max-cache-age 1w --exclude-mail --threads 4 --timeout 30 --retry-wait-time 60 --user-agent 'Mozilla/5.0 (Windows NT x.y; rv:10.0) Gecko/20100101 Firefox/10.0' --no-progress 'content/**/*.md'
           fail: true