Update deploy-pages from v4 to v5 (#56)

deploy-pages v4 uses a Node.js version that is now out of date.
v5 updates to a supported Node.js version.

Author: SeanTAllen

.github/workflows/generate-documentation.yml

@@ -39,4 +39,4 @@ jobs:
           path: 'build/valbytes-docs/site/'
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v5

.github/workflows/release.yml

@@ -61,7 +61,7 @@ jobs:
           path: 'build/valbytes-docs/site/'
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v5
 
   trigger-release-announcement:
     name: Trigger release announcement