deps: update dependency big.js to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
big.js	^6.2.2 -> ^7.0.0

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Release Notes

MikeMcl/big.js (big.js)

v7.0.1

Compare Source

• 21/04/25
• Remove legacy docs and version selector.

v7.0.0

Compare Source

• 21/04/25
• Add GitHub Actions CI.
• #​210 Check for Symbol support.
• #​220 Prevent new constructor creation if undefined is passed explicitly.

v6.2.2

Compare Source

• 10/09/24
• #​212 Bugfix: sqrt error when Big.strict is true.

v6.2.1

Compare Source

• 09/07/22
• #​191 Bugfix: round may result in improper coefficient.

v6.2.0

Compare Source

• 04/06/22
• Add note that a Big number is created from a numbers toString value.
• #​173 Add Symbol.for('nodejs.util.inspect.custom').
• Allow BigInt when Big.strict is true.
• #​177 Add neg method to negate a Big number.
• Add to package.json exports.

v6.1.1

Compare Source

• 03/05/21
• #​169 Bugfix: round, toFixed etc. using original constructor RM (bug introduced in v6.0.0).
• #​169 Correct rounding mode documentation.
• Add version number to legacy documentation.

v6.1.0

Compare Source

• 26/04/21
• #​165 Add missing documentation of toFixed etc. rounding mode parameter.
• #​150 Add static rounding modes to Big constructor.

v6.0.3

Compare Source

• 02/12/20
• #​148 Bugfix: primitive numbers passed to constructor internally in strict mode.

v6.0.2

Compare Source

• 31/10/20
• #​147 Change toJSON to be an alias of toString.

v6.0.1

Compare Source

• 30/09/20
• Correct sqrt initial estimate.

v6.0.0

Compare Source

• 25/09/20
• Add optional rounding mode parameter to toExponential, toFixed and toPrecision.
• Add a strict mode to disallow imprecise number/Big conversions when Big.strict = true.
• Add toNumber method.
• Add prec method to round a Big to a specified number of significant digits.
• Add version selector to API documentation.
• Change toJSON to return exponential format.
• Remove big.min.js.
• Remove Big.version.
• Rename doc folder to docs to use it as the GitHub publishing source.
• Add legacy API documentation to docs.
• Add README to perf directory.
• Refactor test suite, and add toNumber and prec tests.
• Update README.

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