Update softprops/action-gh-release action to v2 (#75)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/cd.yml

@@ -26,7 +26,7 @@ jobs:
         env:
           GOOS: linux
       - name: Create release
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
         with:
           files: advent-of-code-2020
         env: