chore: update Retype GitHub Action to use env-based key (#58)

Author: patricklafrance

.github/workflows/retype-action.yml

@@ -1,6 +1,6 @@
 name: Publish documentation website to GitHub Pages
 on:
-  workflow_dispatch: {}
+  workflow_dispatch:
   push:
     branches: ["main"]
 
@@ -16,14 +16,10 @@ jobs:
     steps:
         - uses: actions/checkout@v4
 
-        - uses: actions/setup-dotnet@v1
-          with:
-            dotnet-version: 9.0.x
-
         - uses: retypeapp/action-build@latest
-          with:
-            license: ${{ secrets.RETYPE_API_KEY }}
+          env:
+              RETYPE_KEY: ${{ secrets.RETYPE_API_KEY }}
 
         - uses: retypeapp/action-github-pages@latest
           with:
-            update-branch: true
+            update-branch: true