fix: verifreg: serialize RmDcProposalID as int, not tuple

[arajasek]

Related Issues

@jennijuju was running the remove datacap workflow on a devnet and reported that it did not work. The issue is that RmDcProposalID is serialized as an int on chain today (not a tuple), but go-state-types expects it to be a tuple.

Proposed Changes

The fix is in filecoin-project/go-state-types#51, this simply updates go-state-types to that commit and adds a test.

Additional Info

• Needs fix: verifreg: RmDcProposalID should not be a struct go-state-types#51 to land
• Needs release of go-state-types

Checklist

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• This PR has tests for new functionality or change in behaviour
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[arajasek]

Approve @jennijuju 's commits