Update dependency bn.js to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
bn.js	^4.11.8 -> ^5.0.0

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Release Notes

indutny/bn.js

v5.2.1

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• fix: serious issue in .toString(16) (#​295)

v5.2.0

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• fix: Buffer not using global in browser (#​260)
• Fix LE constructor for HEX (#​265)

v5.1.3

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• Add support for defined but not implemented Symbol.for (#​252)

v5.1.2

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• Fix BN v5/v4 interoperability issue (#​249)

v5.1.1

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• Temporary workaround for BN#_move (#​236)
• Add eslintrc instead config in package.json (#​237)

v5.1.0

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• Benchmark for BigInt (#​226)
• Add documentation for max/min (#​232)
• Update BN#inspect for Symbols (#​225)
• Improve performance of toArrayLike (#​222)
• temporary disable jumboMulTo in BN#mulTo (#​221)
• optimize toBitArray function (#​212)
• fix iaddn sign issue (#​216)

v5.0.0

Compare Source

• travis: update node versions (#​205)
• Refactor buffer constructor (#​200)
• lib: fix for negative numbers: imuln, modrn, idivn (#​185)
• bn: fix Red#imod (#​178)
• check unexpected high bits for invalid characters (#​173)
• document support very large integers (#​158)
• only define toBuffer if Buffer is defined (#​172)
• lib: better validation of string input (#​151)
• tests: reject decimal input in constructor (#​91)
• bn: make .strip() an internal method (#​105)
• lib: deprecate .modn() introduce .modrn() (#​112 #​129 #​130)
• bn: don't accept invalid characters (#​141)
• package: use files insteadof .npmignore (#​152)
• bn: improve allocation speed for buffers (#​167)
• toJSON to default to interoperable hex (length % 2) (#​164)

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