RHEL 7 ELS: libgs-devel の依存関係がないため、`yum update` が失敗する

Issue

• yum update コマンドは以下のように失敗します。

# yum update 
Resolving Dependencies
--> Running transaction check
---> Package libgs.x86_64 0:9.25-5.el7 will be updated
--> Processing Dependency: libgs(x86-64) = 9.25-5.el7 for package: libgs-devel-9.25-5.el7.x86_64
---> Package libgs.x86_64 0:9.25-5.el7_9.1 will be an update
--> Finished Dependency Resolution
Error: Package: libgs-devel-9.25-5.el7.x86_64 (@rhel-7-server-optional-rpms)
           Requires: libgs(x86-64) = 9.25-5.el7
           Removing: libgs-9.25-5.el7.x86_64 (@rhel-7-server-rpms)
               libgs(x86-64) = 9.25-5.el7
           Updated By: libgs-9.25-5.el7_9.1.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-5.el7_9.1
           Available: libgs-9.25-2.el7.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7
           Available: libgs-9.25-2.el7_7.1.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7_7.1
           Available: libgs-9.25-2.el7_7.2.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7_7.2
           Available: libgs-9.25-2.el7_7.3.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7_7.3
**********************************************************************
yum can be configured to try to resolve such errors by temporarily enabling
disabled repos and searching for missing dependencies.
To enable this functionality please set 'notify_only=0' in /etc/yum/pluginconf.d/search-disabled-repos.conf
**********************************************************************

Error: Package: libgs-devel-9.25-5.el7.x86_64 (@rhel-7-server-optional-rpms)
           Requires: libgs(x86-64) = 9.25-5.el7
           Removing: libgs-9.25-5.el7.x86_64 (@rhel-7-server-rpms)
               libgs(x86-64) = 9.25-5.el7
           Updated By: libgs-9.25-5.el7_9.1.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-5.el7_9.1
           Available: libgs-9.25-2.el7.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7
           Available: libgs-9.25-2.el7_7.1.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7_7.1
           Available: libgs-9.25-2.el7_7.2.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7_7.2
           Available: libgs-9.25-2.el7_7.3.x86_64 (rhel-7-server-els-rpms)
               libgs(x86-64) = 9.25-2.el7_7.3
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest