♻️ use new gemspec action

Author: bitbrain

.github/actions/gemspec-fetch/Dockerfile

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v2
       - name: 💎 Extract gemspec info
         id: gemspec_fetch
-        uses: ./.github/actions/gemspec-fetch
+        uses: bitbrain/gemspec-fetch@1.0.0
         with:
           specfile: jekyll-dash.gemspec
       - name: 🕵️‍♂️ investigate if tag exists