Fix pip install in python based action step

[dsimansk]

Changes

• Fix pip install in python based action step

Related to:
knative/infra#530

/cc @upodroid @skonto @cardil

[skonto]

/lgtm
/approve

/hold for others

[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsimansk, ReToCode, skonto

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[upodroid]

/hold cancel
/override "Lint / style / suggester / yaml (pull_request)"

[knative-prow]

@upodroid: /override requires failed status contexts, check run or a prowjob name to operate on.
The following unknown contexts/checkruns were given:

• Lint / style / suggester / yaml (pull_request)

Only the following failed contexts/checkruns were expected:

• EasyCLA
• style / Golang
• style / suggester / github_actions
• style / suggester / shell
• style / suggester / yaml
• tide

If you are trying to override a checkrun that has a space in it, you must put a double quote on the context.

In response to this:

/hold cancel
/override "Lint / style / suggester / yaml (pull_request)"

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[upodroid]

/override "style / suggester / yaml"

[knative-prow]

@upodroid: Overrode contexts on behalf of upodroid: style / suggester / yaml

In response to this:

/override "style / suggester / yaml"

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