fix(ci): use semgrep container image for security scan

[trivikr]

Issue

Job is getting skipped, which stops automated merging of monthly lockfile updates.
Example: https://github.com/aws/aws-sdk-js-codemod/actions/runs/19450325324/job/55653614702?pr=1010

Making the change as per latest CI configuration
https://semgrep.dev/docs/semgrep-ci/sample-ci-configs#github-actions

Description

Uses semgrep container image for security scan

Testing

CI

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[changeset-bot]

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Latest commit: 04208af

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