fix: Increase maximum code body length for contract deploys

[zone117x]

This PR was published to npm with the version 7.0.6-pr.1+4bd8d3e2
e.g. npm install @stacks/[email protected]+4bd8d3e2 --save-exact

Large (more than 100k bytes) tx-deploy txs would deserialization would fail with error:

Error: String length exceeds maximum bytes 100000
    at createLPString (./signer-metrics-api/node_modules/@stacks/transactions/dist/wire/create.js:162:15)
    at deserializeLPString (./signer-metrics-api/node_modules/@stacks/transactions/dist/wire/serialization.js:154:40)
    at deserializePayload (./signer-metrics-api/node_modules/@stacks/transactions/dist/wire/serialization.js:423:30)
    at deserializeTransaction (./signer-metrics-api/node_modules/@stacks/transactions/dist/transaction.js:153:51)

This PR updates the string length constants to match those from stacks-core.

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[janniks]

Looks good, one test is failing — I'll fix that 👍

[codecov]

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