feat(objectionary#3038): add trufflehog-oss workflow

[slry]

@yegor256 take a look please

Closes #3038

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PR-Codex overview

This PR updates the license information and adds a GitHub Actions workflow for trufflehog security scanning.

Detailed summary

• Updated license to MIT with copyright notice
• Added GitHub Actions workflow for trufflehog security scanning
• Workflow triggers on push and pull requests to the master branch
• Workflow runs trufflehog security scanning with extra_args set to --only-verified

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[slry]

@yegor256 done.

[slry]

@yegor256 can we merge this?

[slry]

@yegor256 can we merge this?

[yegor256]

@slry thanks!