chore(deps): bump big.js and @types/big.js

Bumps [big.js](https://github.com/MikeMcl/big.js) and [@types/big.js](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/big.js). These dependencies needed to be updated together.

Updates `big.js` from 5.2.2 to 6.2.1
- [Release notes](https://github.com/MikeMcl/big.js/releases)
- [Changelog](https://github.com/MikeMcl/big.js/blob/master/CHANGELOG.md)
- [Commits](MikeMcl/big.js@v5.2.2...v6.2.1)

Updates `@types/big.js` from 4.0.5 to 6.1.5
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/big.js)

---
updated-dependencies:
- dependency-name: big.js
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/big.js"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -45,7 +45,7 @@
     "@swapr/core": "^0.3.19",
     "@swapr/periphery": "^0.3.22",
     "@uniswap/smart-order-router": "^2.6.0",
-    "big.js": "^5.2.2",
+    "big.js": "^6.2.1",
     "dayjs": "^1.11.0",
     "debug": "^4.3.4",
     "decimal.js-light": "^2.5.1",
@@ -63,7 +63,7 @@
     "@graphql-codegen/typescript": "2.5.1",
     "@graphql-codegen/typescript-graphql-request": "^4.4.10",
     "@graphql-codegen/typescript-operations": "^2.4.2",
-    "@types/big.js": "^4.0.5",
+    "@types/big.js": "^6.1.5",
     "@types/debug": "^4.1.7",
     "@types/jest": "^27.0.0",
     "@types/lodash.flatmap": "^4.5.6",