Document the need to use quotes around Kubernetes version

[abhay-krishna]

Due to bugs (1, 2) in the underlying gopkg.in/yaml.v2 parser used by the sigs.k8s.io/yaml module (same issue also logged there) that we consume, the Kubernetes version with minor versions which is a multiple of 10, such as 1.30, 1.40, will be parsed as float64 if specified without quotes in the cluster config file, which causes the trailing zero to get dropped, thereby leading to 1.3, 1.4 which are incorrect. This can be prevented by using quotes around the Kubernetes version.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.36%. Comparing base (79b3a53) to head (182c40d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9175      +/-   ##
==========================================
- Coverage   72.37%   72.36%   -0.01%     
==========================================
  Files         585      585              
  Lines       45713    45713              
==========================================
- Hits        33085    33082       -3     
- Misses      10890    10892       +2     
- Partials     1738     1739       +1     

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