install latest Scalar::Util

Author: skaji

.github/workflows/testsuite.yml

@@ -22,7 +22,9 @@ jobs:
       - name: perl -V
         run: perl -V
       - name: install dependencies
-        run: cpanm -nq --with-configure --with-develop --with-suggests --installdeps .
+        run: |
+          cpanm -nq --with-configure --with-develop --with-suggests --installdeps .
+          cpanm -nq Scalar::Util
       - name: Build.PL
         run: perl Build.PL
       - run: ./Build