Bump big.js from 6.0.3 to 6.1.1

Bumps [big.js](https://github.com/MikeMcl/big.js) from 6.0.3 to 6.1.1.
- [Release notes](https://github.com/MikeMcl/big.js/releases)
- [Changelog](https://github.com/MikeMcl/big.js/blob/master/CHANGELOG.md)
- [Commits](MikeMcl/big.js@v6.0.3...v6.1.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

yarn.lock

@@ -1908,9 +1908,9 @@ before-after-hook@^2.0.0:
   integrity sha512-IWIbu7pMqyw3EAJHzzHbWa85b6oud/yfKYg5rqB5hNE8CeMi3nX+2C2sj0HswfblST86hpVEOAb9x34NZd6P7A==
 
 big.js@^6.0.3:
-  version "6.0.3"
-  resolved "https://registry.yarnpkg.com/big.js/-/big.js-6.0.3.tgz#8b4d99ac7023668e0e465d3f78c23b8ac29ad381"
-  integrity sha512-n6yn1FyVL1EW2DBAr4jlU/kObhRzmr+NNRESl65VIOT8WBJj/Kezpx2zFdhJUqYI6qrtTW7moCStYL5VxeVdPA==
+  version "6.1.1"
+  resolved "https://registry.yarnpkg.com/big.js/-/big.js-6.1.1.tgz#63b35b19dc9775c94991ee5db7694880655d5537"
+  integrity sha512-1vObw81a8ylZO5ePrtMay0n018TcftpTA5HFKDaSuiUDBo8biRBtjIobw60OpwuvrGk+FsxKamqN4cnmj/eXdg==
 
 bluebird@^3.5.1, bluebird@^3.5.3, bluebird@^3.5.5:
   version "3.7.2"