Bump ejs from 2.6.1 to 3.1.7 in /Lab 4 (SupplyChainLog)/Solidity (#75)

Bumps [ejs](https://github.com/mde/ejs) from 2.6.1 to 3.1.7.
- [Release notes](https://github.com/mde/ejs/releases)
- [Changelog](https://github.com/mde/ejs/blob/main/CHANGELOG.md)
- [Commits](mde/ejs@v2.6.1...v3.1.7)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: direct:production
...

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Lab 4 (SupplyChainLog)/Solidity/package-lock.json

@@ -44,7 +44,7 @@
     "truffle-assertions": "^0.7.1"
   },
   "dependencies": {
-    "ejs": "^2.5.7",
+    "ejs": "^3.1.7",
     "solc": "^0.5.2",
     "solium": "^1.1.8",
     "truffle": "^5.0.0",