Bump karma from 6.3.20 to 6.4.0

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](https://github.com/karma-runner/karma/compare/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>

package-lock.json

@@ -6400,9 +6400,9 @@
       "dev": true
     },
     "node_modules/karma": {
-      "version": "6.3.20",
-      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.20.tgz",
-      "integrity": "sha512-HRNQhMuKOwKpjYlWiJP0DUrJOh+QjaI/DTaD8b9rEm4Il3tJ8MijutVZH4ts10LuUFst/CedwTS6vieCN8yTSw==",
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/karma/-/karma-6.4.0.tgz",
+      "integrity": "sha512-s8m7z0IF5g/bS5ONT7wsOavhW4i4aFkzD4u4wgzAQWT4HGUeWI3i21cK2Yz6jndMAeHETp5XuNsRoyGJZXVd4w==",
       "dev": true,
       "dependencies": {
         "@colors/colors": "1.5.0",
@@ -15055,9 +15055,9 @@
       "dev": true
     },
     "karma": {
-      "version": "6.3.20",
-      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.20.tgz",
-      "integrity": "sha512-HRNQhMuKOwKpjYlWiJP0DUrJOh+QjaI/DTaD8b9rEm4Il3tJ8MijutVZH4ts10LuUFst/CedwTS6vieCN8yTSw==",
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/karma/-/karma-6.4.0.tgz",
+      "integrity": "sha512-s8m7z0IF5g/bS5ONT7wsOavhW4i4aFkzD4u4wgzAQWT4HGUeWI3i21cK2Yz6jndMAeHETp5XuNsRoyGJZXVd4w==",
       "dev": true,
       "requires": {
         "@colors/colors": "1.5.0",