chore(RELEASE.md) add check item about bumping the Helm chart version

[michaelbeaumont]

No description provided.

[bartsmykla]

lgtm

[codecov-commenter]

Codecov Report

Merging #3204 (cae318e) into master (5494f86) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3204   +/-   ##
=======================================
  Coverage   52.39%   52.39%           
=======================================
  Files         928      928           
  Lines       54044    54044           
=======================================
+ Hits        28318    28319    +1     
  Misses      23504    23504           
+ Partials     2222     2221    -1     

Impacted Files	Coverage Δ
pkg/core/resources/manager/cache.go	83.11% <0.00%> (-5.20%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	83.90% <0.00%> (+1.14%)	⬆️
pkg/plugins/runtime/gateway/route/sorter.go	71.79% <0.00%> (+10.25%)	⬆️

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