chore: switch merbridge image registry to upstream

[bartsmykla]

As merbridge was released with support of Kuma in its CNI plugin
we can switch to use upstream image instead our own

Checklist prior to review

• Link to docs PR or issue -- just replacing the image to the upstream one
• Link to UI issue or PR -- just replacing the image to the upstream one
• Is the issue worked on linked? -- just replacing the image to the upstream one
• The PR does not hardcode values that might break projects that depend on kuma (e.g. "kumahq" as a image registry) -- just replacing the image to the upstream one
• The PR will work for both Linux and Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS -- just replacing the image to the upstream one
• Unit Tests -- just replacing the image to the upstream one
• E2E Tests -- just replacing the image to the upstream one
• Manual Universal Tests -- just replacing the image to the upstream one
• Manual Kubernetes Tests -- just replacing the image to the upstream one
• Do you need to update UPGRADE.md? -- just replacing the image to the upstream one
• Does it need to be backported according to the backporting policy? -- just replacing the image to the upstream one

Changelog: chore(helm): switch merbridge image registry to upstream

[codecov-commenter]

Codecov Report

Merging #4838 (d619c22) into master (9985228) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4838   +/-   ##
=======================================
  Coverage   46.46%   46.47%           
=======================================
  Files         690      690           
  Lines       47069    47069           
=======================================
+ Hits        21872    21873    +1     
+ Misses      23272    23271    -1     
  Partials     1925     1925           

Impacted Files	Coverage Δ
pkg/xds/generator/direct_access_proxy_generator.go	90.90% <0.00%> (+1.13%)	⬆️

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