Bump helm-unittest helm plugin version to v0.4.2

[jenkins-infra-updatecli]

Bump `helm-unittest` helm plugin version

Update helm-unittest version in the GitHub Action workflow

change detected: * key "$.env.UNITTEST_VERSION" updated from "v0.4.1" to "v0.4.2", in file ".github/workflows/test.yml"

v0.4.2

Release published on the 2024-02-24 00:34:55 +0000 UTC at the url https://github.com/helm-unittest/helm-unittest/releases/tag/v0.4.2

**Improvements**
- Improve storing generated template when debug flag enabled (credits @thepeak99)
- Improve development (credits @ivankatliarchuk)

**Fixes**
- Fix global set and set override (resolves #210, resolves #276)
- Fix debug flag by changing name to debugPlugin flag (resolves #241)
- Fix empty documentSelector (credits @michaelruigrok)

**Updates**
- Update packages to latest patch versions (credits @ivankatliarchuk, credits @stavros-k, resolves #295)
- Update documentation (credits @tochev)

Jenkins pipeline link

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