Bump yarn from 1.22.11 to 1.22.15

Bumps [yarn](https://github.com/yarnpkg/yarn) from 1.22.11 to 1.22.15.
- [Release notes](https://github.com/yarnpkg/yarn/releases)
- [Changelog](https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md)
- [Commits](yarnpkg/yarn@1.22.11...v1.22.15)

---
updated-dependencies:
- dependency-name: yarn
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -28,7 +28,7 @@
     "popper.js": "^1.16.1",
     "shariff": "^3.2.1",
     "tinymce": "^5.9.2",
-    "yarn": "^1.22.11"
+    "yarn": "^1.22.15"
   },
   "scripts": {
     "build:css:sass": "sass wger/core/static/scss/main.scss:wger/core/static/yarn/bootstrap-compiled.css",

yarn.lock

@@ -750,7 +750,7 @@ xmlhttprequest@1:
   resolved "https://registry.yarnpkg.com/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz#67fe075c5c24fef39f9d65f5f7b7fe75171968fc"
   integrity sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw=
 
-yarn@^1.22.11:
-  version "1.22.11"
-  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.22.11.tgz#d0104043e7349046e0e2aec977c24be106925ed6"
-  integrity sha512-AWje4bzqO9RUn3sdnM5N8n4ZJ0BqCc/kqFJvpOI5/EVkINXui0yuvU7NDCEF//+WaxHuNay2uOHxA4+tq1P3cg==
+yarn@^1.22.15:
+  version "1.22.15"
+  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.22.15.tgz#3431d5f134d3c752a57a9dd7f5e1167627ca3cc3"
+  integrity sha512-AzoEDxj256BOS/jqDXA3pjyhmi4FRBBUMgYoTHI4EIt2EhREkvH0soPVEtnD+DQIJfU5R9bKhcZ1H9l8zPWeoA==