Update dependency helm/helm to v4

[pdabelf5]

Proposed changes

Update dependency helm/helm to v4

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.20%. Comparing base (dc867f6) to head (183617b).

Additional details and impacted files

@@                Coverage Diff                @@
##           release-2026-lts   #10609   +/-   ##
=================================================
  Coverage             55.20%   55.20%           
=================================================
  Files                    97       97           
  Lines                 19651    19651           
=================================================
  Hits                  10848    10848           
  Misses                 8193     8193           
  Partials                610      610           

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[github-actions]

Package Report

Details

gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus, 37.0.4-1~trixie, amd64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus-module-njs, 37.0+1.0.0-1~trixie, amd64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus-module-otel, 37.0+0.1.2-1~trixie, amd64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus-module-fips-check, 37.0+0.1-1~trixie, amd64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-agent, 3.11.3~trixie, amd64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus, 37.0.4-1~trixie, arm64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus-module-njs, 37.0+1.0.0-1~trixie, arm64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus-module-otel, 37.0+0.1.2-1~trixie, arm64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-plus-module-fips-check, 37.0+0.1-1~trixie, arm64
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic/nginx-plus-ingress:t-e824c3c5d869de3cc1993ec4a01a80d3, nginx-agent, 3.11.3~trixie, arm64

[javorszky]

per conversation with gemini, helm v3 used to agressively strip trailing newlines from template files

v4 no longer does that, so rendered snap retains those blank lines that were previously stripped out, effectively adding them back in