make reviewable fails

[tamalsaha]

Describe the bug a clear and concise description of what the bug is.

INFO[2023-10-24T05:08:09-07:00] Generating README Documentation for chart charts/flux2-notification
Error: unknown flag: --helm3
Usage:
  unittest [flags] CHART [...]

Flags:
      --color                  enforce printing colored output even stdout is not a tty. Set to false to disable color
  -d, --debug                  enable debug logging
  -q, --failfast               direct quit testing, when a test is failed
  -f, --file stringArray       glob paths of test files location, default to tests/*_test.yaml (default [tests/*_test.yaml])
  -h, --help                   help for unittest
  -o, --output-file string     output-file the file where testresults are written in JUnit format, defaults no output is written to file
  -t, --output-type string     output-type the file-format where testresults are written in, accepted types are (JUnit, NUnit, XUnit, Sonar) (default "XUnit")
      --strict                 strict parse the testsuites
  -u, --update-snapshot        update the snapshot cached if needed, make sure you review the change before update
  -v, --values stringArray     absolute or glob paths of values files location to override helmchart values
  -s, --with-subchart charts   include tests of the subcharts within charts folder (default true)

unknown flag: --helm3
Error: plugin "unittest" exited with error
make: *** [unittests] Error 1

What's your helm version?

v3.10

What's your kubectl version?

1.28.x

What's the chart version?

main branch

What happened?

No response

What you expected to happen?

No response

How to reproduce it?

No response

Enter the changed values of values.yaml?

No response

Enter the command that you execute and failing/misfunctioning.

make reviewable

Anything else we need to know?

No response