Add support for electron v21 prebuilds (WiseLibs#909)

Author: m4heshd

.github/workflows/build.yml

@@ -68,9 +68,9 @@ jobs:
           node-version: 16
       - run: npm install --ignore-scripts
       - run: npx --no-install prebuild -r node -t 14.0.0 -t 16.0.0 -t 18.0.0 --include-regex 'better_sqlite3.node$' -u ${{ secrets.GITHUB_TOKEN }}
-      - run: npx --no-install prebuild -r electron -t 16.0.0 -t 17.0.0 -t 18.0.0 -t 19.0.0 -t 20.0.0 --include-regex 'better_sqlite3.node$' -u ${{ secrets.GITHUB_TOKEN }}
+      - run: npx --no-install prebuild -r electron -t 16.0.0 -t 17.0.0 -t 18.0.0 -t 19.0.0 -t 20.0.0 -t 21.0.0 --include-regex 'better_sqlite3.node$' -u ${{ secrets.GITHUB_TOKEN }}
       - if: matrix.os == 'windows-2019'
-        run: npx --no-install prebuild -r electron -t 16.0.0 -t 17.0.0 -t 18.0.0 -t 19.0.0 -t 20.0.0 --include-regex 'better_sqlite3.node$' --arch ia32 -u ${{ secrets.GITHUB_TOKEN }}
+        run: npx --no-install prebuild -r electron -t 16.0.0 -t 17.0.0 -t 18.0.0 -t 19.0.0 -t 20.0.0 -t 21.0.0 --include-regex 'better_sqlite3.node$' --arch ia32 -u ${{ secrets.GITHUB_TOKEN }}
 
   prebuild-alpine:
     name: Prebuild on alpine