unable to upgrade mysql to mariadb 10.3 on whm

I am getting one error when I try to upgrade mysql to mariadb 10.3 on whm

The system was not able to ensure the availability of the “MariaDB-client” package: (XID wbx3ef) “/usr/bin/yum” reported error code “1” when it ended: https://yum.mariadb.org/10.2/centos7-amd64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below wiki article

https://wiki.centos.org/yum-errors

If above article doesn't help to resolve this issue please use https://bugs.centos.org/.



One of the configured repositories failed (MariaDB102),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

1. Contact the upstream for the repository and get them to fix the problem.

2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).

3. Run the command with the repository temporarily disabled
yum --disablerepo=MariaDB102 ...

4. Disable the repository permanently, so yum won't use it by default. Yum
will then just ignore the repository until you permanently enable it
again or use --enablerepo for temporary usage:

yum-config-manager --disable MariaDB102
or
subscription-manager repos --disable=MariaDB102

5. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:

yum-config-manager --save --setopt=MariaDB102.skip_if_unavailable=true

failure: repodata/repomd.xml from MariaDB102: [Errno 256] No more mirrors to try.
https://yum.mariadb.org/10.2/centos7-amd64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
Obtained version information from system.
Proceeding with MySQL/MariaDB upgrade despite the following:
Critical: MariaDB enables "strict mode" by default as of version 10.2. Strict mode controls how MariaDB and MySQL handle invalid or missing values in data-change statements such as INSERT or UPDATE. Applications not built with strict mode enabled may cause undesired behavior; please verify applications using MariaDB are compatible before upgrading. More information about strict mode is available here. Critical: In MariaDB® 10.3, the mysqldump client includes logic for the mysql.transaction_registry table. You cannot use the mysqldump client from an earlier MariaDB release on MariaDB 10.3 and later. For more information about how to upgrade to MariaDB 10.3, read the MariaDB upgrade documentation. Normal: The selected MariaDB version (10.3) is more than one generation newer than the currently installed version. The upgrade process will iterate over each intervening version to ensure tables are upgraded appropriately.