ci: bump actions/checkout from 4 to 7 (#3)

[xormania]

Bumps actions/checkout from 4 to 7.

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updated-dependencies:

• dependency-name: actions/checkout dependency-version: '7' dependency-type: direct:production update-type: version-update:semver-major ...

Pull Request

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• The linked maintainer request, issue, or discussion is included below.

Maintainer request:

Branch Target

• This PR targets dev, or
• This PR targets main from dev as a formal promotion PR.

PRs into main from branches other than dev are not accepted.

Scope

• This change is limited to the invited scope.
• This change does not modify doctrine, authority, governance, command contracts, or protected surfaces unless explicitly requested.
• This change does not add telemetry, network behavior, external services, or self-install behavior.
• This change does not add legacy compatibility paths unless explicitly requested.

Validation

• bash -n bin/agently lib/*.sh tests/*.sh
• ./tests/smoke.sh
• Relevant targeted tests were run.

Notes