fix(deps): update secp256k1 to 5.0.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
secp256k1	^3.5.2 -> ^5.0.0

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Release Notes

cryptocoinjs/secp256k1-node (secp256k1)

v5.0.0

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• 3482be9 Fix segfaults when used with worker_threads (#​195)
• 4afabb4 docs: fix example of unrelated public/private pair (#​192)

v4.0.3

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• 95b6176 Update prebuildify (#​187)
• 4223dd4 Update elliptic to 6.5.4 (CVE-2020-28498) (#​186)

v4.0.2

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• 466cb57 Support musl (#​169)
• b6d21b9 Add in place functions to API.md (#​168)

v4.0.1

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• d2664cb Fix publicKeyVerify length check (#​167)

v4.0.0

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• Update to n-api (https://github.com/cryptocoinjs/secp256k1-node/pull/160)
• Remove second pure js implementation
• Change API

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