fix: contracts/multisig/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:debug:20170905

contracts/multisig/package.json

@@ -55,7 +55,7 @@
         "@0x/contracts-gen": "^2.0.10",
         "@0x/contracts-test-utils": "^5.3.4",
         "@0x/contracts-utils": "^4.5.1",
-        "@0x/dev-utils": "^3.3.0",
+        "@0x/dev-utils": "^5.0.0",
         "@0x/sol-compiler": "^4.1.1",
         "@0x/tslint-config": "^4.1.0",
         "@0x/types": "^3.2.0",
@@ -70,7 +70,7 @@
         "dirty-chai": "^2.0.1",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
-        "mocha": "^6.2.0",
+        "mocha": "^8.3.0",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
         "solhint": "^1.4.1",