chore(deps): update actions/checkout digest to 7739b9b

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	`96f5310` -> `7739b9b`

[ ] Updates have been tested and work
[ ] If updates are AWS related, versions match the infrastructure (e.g. Lambda runtime, database, etc.)

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cds-snc / dns