fix: package.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-MINIMATCH-3050818
- https://snyk.io/vuln/SNYK-JS-MOCHA-2863123
- https://snyk.io/vuln/SNYK-JS-SHELLJS-2332187
- https://snyk.io/vuln/SNYK-JS-UNDERSCORE-1080984


The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-567746

.snyk

@@ -0,0 +1,10 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.25.1
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  SNYK-JS-LODASH-567746:
+    - solium > lodash:
+        patched: '2023-08-21T02:29:23.814Z'
+        id: SNYK-JS-LODASH-567746
+        path: solium > lodash

package.json

@@ -6,7 +6,9 @@
     "test": "truffle test",
     "lint": "solium --dir ./contracts",
     "prepublishOnly": "truffle compile && truffle networks --clean",
-    "pub": "npm run prepublishOnly && npm publish"
+    "pub": "npm run prepublishOnly && npm publish",
+    "prepublish": "npm run snyk-protect",
+    "snyk-protect": "snyk-protect"
   },
   "main": "index.js",
   "repository": {
@@ -23,13 +25,15 @@
     "bluebird": "^3.5.2",
     "eth-ens-namehash": "^2.0.8",
     "solc": "^0.5.13",
-    "testrpc": "0.0.1"
+    "testrpc": "0.0.1",
+    "@snyk/protect": "latest"
   },
   "devDependencies": {
     "@ensdomains/test-utils": "1.3.0",
-    "solidity-coverage": "^0.4.14",
+    "solidity-coverage": "^0.6.0",
     "solium": "^1.0.4",
-    "web3-utils": "^1.3.0",
-    "truffle": "^5.1.62"
-  }
+    "web3-utils": "^1.3.6",
+    "truffle": "^5.6.7"
+  },
+  "snyk": true
 }