Bump karma from 6.3.20 to 6.4.0 in /samples/lib/spa-angular-client

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.20 to 6.4.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.3.20...v6.4.0)

---
updated-dependencies:
- dependency-name: karma
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

samples/lib/spa-angular-client/package-lock.json

@@ -50,7 +50,7 @@
     "codelyzer": "^6.0.2",
     "jasmine-core": "~4.1.1",
     "jasmine-spec-reporter": "~7.0.0",
-    "karma": "~6.3.20",
+    "karma": "~6.4.0",
     "karma-chrome-launcher": "~3.1.1",
     "karma-coverage-istanbul-reporter": "~3.0.2",
     "karma-jasmine": "~5.0.1",