Bump karma from 6.3.19 to 6.3.20

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.19 to 6.3.20.
- [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/v6.3.19...v6.3.20)

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

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

package-lock.json

@@ -6463,9 +6463,9 @@
       "dev": true
     },
     "node_modules/karma": {
-      "version": "6.3.19",
-      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.19.tgz",
-      "integrity": "sha512-NDhWckzES/Y9xMiddyU1RzaKL76/scCsu8Mp0vR0Z3lQRvC3p72+Ab4ppoxs36S9tyPNX5V48yvaV++RNEBPZw==",
+      "version": "6.3.20",
+      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.20.tgz",
+      "integrity": "sha512-HRNQhMuKOwKpjYlWiJP0DUrJOh+QjaI/DTaD8b9rEm4Il3tJ8MijutVZH4ts10LuUFst/CedwTS6vieCN8yTSw==",
       "dev": true,
       "dependencies": {
         "@colors/colors": "1.5.0",
@@ -15183,9 +15183,9 @@
       "dev": true
     },
     "karma": {
-      "version": "6.3.19",
-      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.19.tgz",
-      "integrity": "sha512-NDhWckzES/Y9xMiddyU1RzaKL76/scCsu8Mp0vR0Z3lQRvC3p72+Ab4ppoxs36S9tyPNX5V48yvaV++RNEBPZw==",
+      "version": "6.3.20",
+      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.20.tgz",
+      "integrity": "sha512-HRNQhMuKOwKpjYlWiJP0DUrJOh+QjaI/DTaD8b9rEm4Il3tJ8MijutVZH4ts10LuUFst/CedwTS6vieCN8yTSw==",
       "dev": true,
       "requires": {
         "@colors/colors": "1.5.0",