Bump ejs from 2.5.7 to 3.1.7 in /Lab 2/Solidity (#77)

Bumps [ejs](https://github.com/mde/ejs) from 2.5.7 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@v2.5.7...v3.1.7)

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

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Lab 2/Solidity/package-lock.json

@@ -42,7 +42,7 @@
     "truffle": "^5.0.0-beta.2"
   },
   "dependencies": {
-    "ejs": "^2.5.7",
+    "ejs": "^3.1.7",
     "ganache-cli": "^6.2.3",
     "solc": "^0.5.0",
     "utf8": "^3.0.0"