Extend e2e workflow matrix to cover Next 16

Author: Makoto Kitamura

.github/workflows/e2e-tests.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        next-version: ["14.0", "14.1", "14.2", "15.0", "15.1", "15.2", "15.3"]
+        next-version: ["14.0", "14.1", "14.2", "15.0", "15.1", "15.2", "15.3", "16.0"]
         node-version: [20]
     steps:
       - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0