rules: add OpenSSH private key to macro private_key_or_password

[oscr]

What type of PR is this?

/kind feature
/kind rule-update

Any specific area of the project related to this PR?

/area rules

What this PR does / why we need it:

I noticed the rules macro private_key_or_password didn't check for OpenSSH private keys so I added it.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

rules(macro: private_key_or_password): now also check for OpenSSH private keys 

[poiana]

Welcome @oscr! It looks like this is your first PR to falcosecurity/falco 🎉

[darryk10]

LGTM

[darryk10]

Thanks for contributing. It looks good to me 👍🏻

[poiana]

LGTM label has been added.

Git tree hash: 8d96c525a0118653786e3b953a4ef0b576657772

[jasondellaluce]

/approve

[jasondellaluce]

/milestone 0.34.0

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: darryk10, jasondellaluce, Kaizhe, leogr, oscr

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• rules/OWNERS [jasondellaluce,leogr]

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Approvers can cancel approval by writing /approve cancel in a comment

[leogr]

Closing and reopening to trigger the CI
/close

[poiana]

@leogr: Closed this PR.

In response to this:

Closing and reopening to trigger the CI
/close

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[leogr]

/reopen

[poiana]

@leogr: Reopened this PR.

In response to this:

/reopen

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