Use current composer and remove legacy PHP compatibility code (#4583)

Author: daledupreez

bin/run-ci-tests.bash

@@ -7,19 +7,12 @@ IFS=$'\n\t'
 # set environment variables
 WC_STRIPE_DIR="$GITHUB_WORKSPACE"
 
-echo 'Updating composer version & Install dependencies...'
-composer self-update 2.0.6 && composer install --no-progress
+echo 'Install composer dependencies...'
+composer install --no-progress
 
 echo 'Starting MySQL service...'
 sudo systemctl start mysql.service
 
-# On GitHub actions, set MySQL authentication to mysql_native_password instead of caching_sha2_password
-# to prevent DB connection problems with PHP versions less than 7.4
-if [[ -n $CI ]]; then
-	echo "Configuring MySQL to use mysql_native_password"
-	mysql -uroot -proot -e "ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root'; FLUSH PRIVILEGES;"
-fi
-
 echo 'Setting up test environment...'
 bash bin/install-wp-tests.sh woocommerce_test root root localhost $WP_VERSION $WC_VERSION false