Update mysql

[tianon]

Changes:

• docker-library/mysql@7f405f6: Merge pull request Improve error message clarity when MYSQL_USER="root" mysql#752 from infosiftr/more-text
• docker-library/mysql@dd8e5db: Improve error message clarity when MYSQL_USER="root"

[github-actions]

Diff for f9db00f:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index d8a85e8..0cdbf30 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -2,16 +2,16 @@ Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon), Joseph Ferguson <yosi
 GitRepo: https://github.com/docker-library/mysql.git
 
 Tags: 5.6.51, 5.6
-GitCommit: 6a9edebd6ed7b0178b0cce7495bea1777cb9f128
+GitCommit: dd8e5db3bc7c717542eb867b6addde7ccc9003e2
 Directory: 5.6
 File: Dockerfile.debian
 
 Tags: 5.7.33, 5.7, 5
-GitCommit: 6a9edebd6ed7b0178b0cce7495bea1777cb9f128
+GitCommit: dd8e5db3bc7c717542eb867b6addde7ccc9003e2
 Directory: 5.7
 File: Dockerfile.debian
 
 Tags: 8.0.23, 8.0, 8, latest
-GitCommit: 6a9edebd6ed7b0178b0cce7495bea1777cb9f128
+GitCommit: dd8e5db3bc7c717542eb867b6addde7ccc9003e2
 Directory: 8.0
 File: Dockerfile.debian
diff --git a/mysql_5.6/docker-entrypoint.sh b/mysql_5.6/docker-entrypoint.sh
index 461e34b..62e6a87 100755
--- a/mysql_5.6/docker-entrypoint.sh
+++ b/mysql_5.6/docker-entrypoint.sh
@@ -156,8 +156,8 @@ docker_verify_minimum_env() {
 	# This will prevent the CREATE USER from failing (and thus exiting with a half-initialized database)
 	if [ "$MYSQL_USER" = 'root' ]; then
 		mysql_error <<-'EOF'
-			MYSQL_USER="root", MYSQL_PASSWORD cannot be used for the root user
-			    Use one of the following to control the root user password:
+			MYSQL_USER="root", MYSQL_USER and MYSQL_PASSWORD are for configuring a regular user and cannot be used for the root user
+			    Remove MYSQL_USER="root" and use one of the following to control the root user password:
 			    - MYSQL_ROOT_PASSWORD
 			    - MYSQL_ALLOW_EMPTY_PASSWORD
 			    - MYSQL_RANDOM_ROOT_PASSWORD
diff --git a/mysql_5/docker-entrypoint.sh b/mysql_5/docker-entrypoint.sh
index 461e34b..62e6a87 100755
--- a/mysql_5/docker-entrypoint.sh
+++ b/mysql_5/docker-entrypoint.sh
@@ -156,8 +156,8 @@ docker_verify_minimum_env() {
 	# This will prevent the CREATE USER from failing (and thus exiting with a half-initialized database)
 	if [ "$MYSQL_USER" = 'root' ]; then
 		mysql_error <<-'EOF'
-			MYSQL_USER="root", MYSQL_PASSWORD cannot be used for the root user
-			    Use one of the following to control the root user password:
+			MYSQL_USER="root", MYSQL_USER and MYSQL_PASSWORD are for configuring a regular user and cannot be used for the root user
+			    Remove MYSQL_USER="root" and use one of the following to control the root user password:
 			    - MYSQL_ROOT_PASSWORD
 			    - MYSQL_ALLOW_EMPTY_PASSWORD
 			    - MYSQL_RANDOM_ROOT_PASSWORD
diff --git a/mysql_latest/docker-entrypoint.sh b/mysql_latest/docker-entrypoint.sh
index 461e34b..62e6a87 100755
--- a/mysql_latest/docker-entrypoint.sh
+++ b/mysql_latest/docker-entrypoint.sh
@@ -156,8 +156,8 @@ docker_verify_minimum_env() {
 	# This will prevent the CREATE USER from failing (and thus exiting with a half-initialized database)
 	if [ "$MYSQL_USER" = 'root' ]; then
 		mysql_error <<-'EOF'
-			MYSQL_USER="root", MYSQL_PASSWORD cannot be used for the root user
-			    Use one of the following to control the root user password:
+			MYSQL_USER="root", MYSQL_USER and MYSQL_PASSWORD are for configuring a regular user and cannot be used for the root user
+			    Remove MYSQL_USER="root" and use one of the following to control the root user password:
 			    - MYSQL_ROOT_PASSWORD
 			    - MYSQL_ALLOW_EMPTY_PASSWORD
 			    - MYSQL_RANDOM_ROOT_PASSWORD