Add check for rocky linux

[dveeden]

What problem does this PR solve?

Rocky Linux 9.1 and later is listed in the documentation as supported, but the checks don't agree with this.

What is changed and how it works?

Add rocky linux to the check

See also:

• https://docs.pingcap.com/tidb/stable/hardware-and-software-requirements#os-and-platform-requirements
• update hardware-and-software-requirements for v7.5 docs#15372

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release notes:

NONE

[dveeden]

Note that there is one open issue related to Rocky Linux: #2292
However I don't think that changes the support status.

/cc @jebter

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (c53895c) 55.53% compared to head (6698f56) 55.42%.

❗ Current head 6698f56 differs from pull request most recent head c89a345. Consider uploading reports for the commit c89a345 to get more accurate results

Files	Patch %	Lines
pkg/cluster/operation/check.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2333      +/-   ##
==========================================
- Coverage   55.53%   55.42%   -0.11%     
==========================================
  Files         325      325              
  Lines       34757    34764       +7     
==========================================
- Hits        19300    19265      -35     
- Misses      13144    13187      +43     
+ Partials     2313     2312       -1     

Flag	Coverage Δ
cluster	44.78% <0.00%> (-0.12%)	⬇️
dm	25.44% <0.00%> (-0.05%)	⬇️
playground	15.24% <ø> (-0.02%)	⬇️
tiup	33.48% <ø> (ø)
unittest	22.29% <ø> (-0.01%)	⬇️

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[dveeden]

Related: https://tidbcommunity.slack.com/archives/C019S7HLP61/p1702885355480039

[kaaaaaaang]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-18 08:34:20.550116276 +0000 UTC m=+863551.587343191: ☑️ agreed by kaaaaaaang.

[kaaaaaaang]

/merge

[kaaaaaaang]

/approve

[ti-chi-bot]

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