Bump ejs from 2.6.2 to 3.1.7 in /source_code (#11)

Bumps [ejs](https://github.com/mde/ejs) from 2.6.2 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@v2.6.2...v3.1.7)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

source_code/package-lock.json

@@ -9,7 +9,7 @@
     "body-parser": "^1.20.1",
     "cookie-parser": "~1.4.4",
     "debug": "~2.6.9",
-    "ejs": "~2.6.1",
+    "ejs": "~3.1.7",
     "express": "~4.18.2",
     "http-errors": "~1.6.3",
     "mongoose": "^5.9.13",