Fix version of big.js

package.json

@@ -73,7 +73,7 @@
     "alphavantage": "2.2.0",
     "angular-material-css-vars": "2.1.0",
     "bent": "7.3.12",
-    "big.js": "^6.1.1",
+    "big.js": "6.1.1",
     "bootstrap": "4.6.0",
     "cache-manager": "3.4.3",
     "cache-manager-redis-store": "2.0.0",
@@ -124,7 +124,7 @@
     "@nrwl/node": "12.5.4",
     "@nrwl/tao": "12.5.4",
     "@nrwl/workspace": "12.5.4",
-    "@types/big.js": "^6.1.1",
+    "@types/big.js": "6.1.1",
     "@types/cache-manager": "3.4.0",
     "@types/jest": "26.0.20",
     "@types/lodash": "4.14.168",

yarn.lock

@@ -2549,9 +2549,10 @@
   dependencies:
     "@babel/types" "^7.3.0"
 
-"@types/big.js@^6.1.1":
+"@types/big.js@6.1.1":
   version "6.1.1"
-  integrity sha1-wr5egeDPDBwxcE47EvdQcS9kdBQ=
+  resolved "https://registry.yarnpkg.com/@types/big.js/-/big.js-6.1.1.tgz#c2be5e81e0cf0c1c31704e3b12f750712f647414"
+  integrity sha512-Zns+nT0hj96ie+GDbL5NeHxhL4wNz8QMxCHqBvxgc4x0hhgQ/o92rPwqxvPBhY3ZYnH8TJGw/8oCkjhOy2Rfzw==
 
 "@types/body-parser@*":
   version "1.19.0"
@@ -3942,15 +3943,16 @@ bent@7.3.12:
     caseless "~0.12.0"
     is-stream "^2.0.0"
 
+big.js@6.1.1:
+  version "6.1.1"
+  resolved "https://registry.yarnpkg.com/big.js/-/big.js-6.1.1.tgz#63b35b19dc9775c94991ee5db7694880655d5537"
+  integrity sha512-1vObw81a8ylZO5ePrtMay0n018TcftpTA5HFKDaSuiUDBo8biRBtjIobw60OpwuvrGk+FsxKamqN4cnmj/eXdg==
+
 big.js@^5.2.2:
   version "5.2.2"
   resolved "https://registry.yarnpkg.com/big.js/-/big.js-5.2.2.tgz#65f0af382f578bcdc742bd9c281e9cb2d7768328"
   integrity sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==
 
-big.js@^6.1.1:
-  version "6.1.1"
-  integrity sha1-Y7NbGdyXdclJke5dt2lIgGVdVTc=
-
 bignumber.js@^9.0.1:
   version "9.0.1"
   resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-9.0.1.tgz#8d7ba124c882bfd8e43260c67475518d0689e4e5"