Bump karma from 6.3.13 to 6.3.15

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.13 to 6.3.15.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.3.13...v6.3.15)

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

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

Author: dependabot[bot]

package.json

@@ -59,7 +59,7 @@
     "jasmine-core": "~3.10.1",
     "jasmine-marbles": "^0.8.4",
     "jasmine-spec-reporter": "~7.0.0",
-    "karma": "~6.3.13",
+    "karma": "~6.3.15",
     "karma-chrome-launcher": "~3.1.0",
     "karma-cli": "^2.0.0",
     "karma-coverage-istanbul-reporter": "~3.0.2",

yarn.lock

@@ -5337,10 +5337,10 @@ karma-source-map-support@1.4.0:
   dependencies:
     source-map-support "^0.5.5"
 
-karma@~6.3.13:
-  version "6.3.13"
-  resolved "https://registry.yarnpkg.com/karma/-/karma-6.3.13.tgz#ff58622c4f913508dbf86506a5fc614be0e98137"
-  integrity sha512-64lbtHBnM/sG7XKvitSQVlImKYNugyjw4K2e8cZYrlZm0GwoWrfsrkzgS/KWY/r3+fVM/2xvT/JN6MyfdttxLw==
+karma@~6.3.15:
+  version "6.3.15"
+  resolved "https://registry.yarnpkg.com/karma/-/karma-6.3.15.tgz#6c3beedb2440b05589a502462140afed724481e7"
+  integrity sha512-4O5X6zVFdmwo/fgjRN84fPG3IvaiOxOjIeZBwBrQYz4nIyGqlF8Wm7C1Hr7idQ9NHgnvJM+LSjZwS1C+qALMGw==
   dependencies:
     body-parser "^1.19.0"
     braces "^3.0.2"
@@ -5357,6 +5357,7 @@ karma@~6.3.13:
     log4js "^6.4.1"
     mime "^2.5.2"
     minimatch "^3.0.4"
+    mkdirp "^0.5.5"
     qjobs "^1.2.0"
     range-parser "^1.2.1"
     rimraf "^3.0.2"