Update Rocky 8.7 to 8.9

[cah]

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dnf check-update

dnf update

After this, /etc/os-release shows version 8.9 but 'uname-a' still shows '4.18.0-425.3.1.el8.
Reboot the server and the kernel became 4.18.0-513.11.1.el8_9.

All functions seemed to work fine except web server is showing a testing page.
Digging deeper and found /usr/lib/systemd/system/httpd.service was modified to default. The Apache server on the server is newer than the default one and I had created a working service file before. Once I restore the service file and reload it, it worked as expected.

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systemctl daemon-reload