infra: fix `source` not found when running `make install`

[cofin]

Use . instead of source so that the make install command works on more shell configurations.

Pull Request Checklist

• [ ] New code has 100% test coverage
• [ ] (If applicable) The prose documentation has been updated to reflect the changes introduced by this PR
• [ ] (If applicable) The reference documentation has been updated to reflect the changes introduced by this PR
• [ ] Pre-Commit Checks were ran and passed
• [ ] Tests were ran and passed

Description

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