Bump @angular/ssr from 19.2.7 to 20.3.4

Bumps [@angular/ssr](https://github.com/angular/angular-cli) from 19.2.7 to 20.3.4.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@19.2.7...20.3.4)

---
updated-dependencies:
- dependency-name: "@angular/ssr"
  dependency-version: 20.3.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -56,7 +56,7 @@
     "@angular/platform-browser-dynamic": "19.1.4",
     "@angular/platform-server": "19.1.4",
     "@angular/router": "19.1.4",
-    "@angular/ssr": "19.2.7",
+    "@angular/ssr": "20.3.4",
     "angular-plotly.js": "^5.2.2",
     "file-saver": "^2.0.5",
     "happy-dom": "17.4.4",