Updating tests to reflect the new output format

[matajoh]

As part of the upgrade of rego-cpp to Rego v0.65.0 the output of the tool is now valid JSON. The PR updates the commit tag and edits the tests so that the grep matches again.

[davidchisnall]

I would rather extract the expressions[0] field from the evaluation result than encode that in the tests and subsequently require every user to do this in their use of the output.

[matajoh]

I would rather extract the expressions[0] field from the evaluation result than encode that in the tests and subsequently require every user to do this in their use of the output.

I've taken a stab at this, let me know what you think.

[davidchisnall]

Looks like the snmalloc clone is broken?

[matajoh]

I've updated it to the 0.4.0 release of Rego. The snmalloc commit issue was upstream in Trieste, and appears to be resolved for now.