fix(builder): fix invoke getInputs take array or string

[FuzzB0t]

Turns out the error only happened because we allowed targets to be defined as strings as well which was causing the getInputs function to incorrectly return values, causing the computation of dependencies to fail.

fixes https://linear.app/usecannon/issue/CAN-405/invoke-implicit-depends-bug

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[dbeal-eth]

We may want to double check the board, but I thought that previously we determined that we thought it was useful to have the ability to specify Target as non-array in the past. If that was the case, we may want to rethink our approach here and fix it so it is able to take non-array in the get inputs function.

Otherwise it looks good