chore(deps): bump @spinnaker/styleguide from 1.0.18 to 1.0.20 (#8167)

Bumps [@spinnaker/styleguide](https://github.com/spinnaker/styleguide) from 1.0.18 to 1.0.20.
- [Release notes](https://github.com/spinnaker/styleguide/releases)
- [Commits](https://github.com/spinnaker/styleguide/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

package.json

@@ -30,7 +30,7 @@
   "dependencies": {
     "@fortawesome/fontawesome-free": "^5.4.1",
     "@spinnaker/kayenta": "^0.0.91",
-    "@spinnaker/styleguide": "^1.0.18",
+    "@spinnaker/styleguide": "^1.0.20",
     "@uirouter/react-hybrid": "1.0.2",
     "@uirouter/rx": "0.6.5",
     "@uirouter/visualizer": "^7.0.0",

yarn.lock

@@ -903,10 +903,10 @@
   resolved "https://registry.yarnpkg.com/@spinnaker/mocks/-/mocks-1.0.4.tgz#d9a5f683fa43c00b17491957551448c07973b9ad"
   integrity sha512-yg8UjBGOqSqA1Ar9CPkOwrYWM6sx9FZkMcg63wijI3iWjylJcRQIiJ2W7NhYf951WjlU69mVSMMxWMjY7RCeZg==
 
-"@spinnaker/styleguide@^1.0.18":
-  version "1.0.18"
-  resolved "https://registry.yarnpkg.com/@spinnaker/styleguide/-/styleguide-1.0.18.tgz#0d627331088e84a6e630d2cd127473f301587962"
-  integrity sha512-8XNYA2u32Ugi8d1XCExCj0CEY+QY8+u+pxC9upKaCTxKSjB8bcQIO93GSZB4cxtpLPkFNEspAGRHF5Ysq7bdJg==
+"@spinnaker/styleguide@^1.0.20":
+  version "1.0.20"
+  resolved "https://registry.yarnpkg.com/@spinnaker/styleguide/-/styleguide-1.0.20.tgz#ad397e134c29f4a33a2ecc5f1235950708aa1b4e"
+  integrity sha512-N3ebcvdZ/O/8KztAQvI9QIbD5zbgfJnHnGJg8Li/yHwBncGxMs3xat7I1Dd6UYKi/wpE/bUBRyASXuFhggh73w==
 
 "@svgr/babel-plugin-add-jsx-attribute@^5.0.1":
   version "5.0.1"