Bug: getSimplePathPlans() fails with TypeError

[augjoh]

Description

After upgrading from 4.30.2 to 4.30.3 model.getSimplePathPlans() emits TypeError.

Expected result

Should run as 4.30.2

Actual result

TypeError: (0 , utils_1.keys) is not a function
    at getSimplePaths (/builds/platynum/certification-authority/flows/node_modules/@xstate/graph/lib/graph.js:316:49)
    at TestModel.getSimplePathPlans (/builds/platynum/certification-authority/flows/node_modules/@xstate/test/lib/index.js:157:54)
    at Suite.<anonymous> (/builds/platynum/certification-authority/flows/test/ca-acme.js:989:51)
[...]

Reproduction

https://gitlab.com/platynum/certification-authority/flows/-/blob/master/test/ca-acme.js#L989

Additional context

Code that triggers this issue and full output of mocha

[calvinchengx]

Yep. Breaks an attempted upgrade to 4.30.3 for me as well.

[davidkpiano]

Added a fix in #3113 - sorry about that!