Use negative integer for from duration

[comp615]

Closes #29. According to Apollo support, the from field should be sent in negative seconds when using a relative timestamp. This updates the value we send

Updated dependencies

Include a list of newly added or updated dependencies

Future work

N/A

Checklist

• Have you fully tested your PR locally?
• [ X ] Have you written thorough tests for your work?
• [ X ] Have you made a CHANGELOG entry?

[comp615]

As before, I don't really know how to test Github actions locally so this is somewhat untested...

[comp615]

Finally came back and tested this locally using a fork:
uses: comp615/apollo-schema-check-action@negative_from_test. Verified that with the fix, the time ranges correctly show up and thus should detect issues.