Fix php.sh url

Author: shivammathur

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
         fi
         for i in $versions; do
           if [ "$i" = "$version" ]; then
-            curl -o /tmp/php.sh -sSL https://raw.githubusercontent.com/actions/virtual-environments/master/images/linux/scripts/installers/php.sh
+            curl -o /tmp/php.sh -sSL https://raw.githubusercontent.com/actions/virtual-environments/main/images/linux/scripts/installers/php.sh
             sed -i "s/\$php_versions/${{ matrix.php-versions }}/g" /tmp/php.sh
             sudo bash /tmp/php.sh || true           
           fi