Merge branch 'main' into katei/js-predicate-method

Author: kateinoigakukun

.github/workflows/docs.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Build HTML by RDoc
         run: rake rdoc
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v2
         with:
           path: ./html