Bump @material-ui/core from 4.11.4 to 4.12.3 (#3554)

Bumps [@material-ui/core](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui) from 4.11.4 to 4.12.3.
- [Release notes](https://github.com/mui-org/material-ui/releases)
- [Changelog](https://github.com/mui-org/material-ui/blob/v4.12.3/CHANGELOG.md)
- [Commits](https://github.com/mui-org/material-ui/commits/v4.12.3/packages/material-ui)

---
updated-dependencies:
- dependency-name: "@material-ui/core"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -250,7 +250,7 @@
   },
   "devDependencies": {
     "@emeraldpay/hashicon-react": "^0.4.0",
-    "@material-ui/core": "^4.11.4",
+    "@material-ui/core": "^4.12.3",
     "@material-ui/icons": "^4.11.2",
     "@material-ui/lab": "^4.0.0-alpha.57",
     "@pmmmwh/react-refresh-webpack-plugin": "^0.4.3",

yarn.lock

@@ -832,14 +832,14 @@
   dependencies:
     cross-spawn "^7.0.1"
 
-"@material-ui/core@^4.11.4":
-  version "4.11.4"
-  resolved "https://registry.yarnpkg.com/@material-ui/core/-/core-4.11.4.tgz#4fb9fe5dec5dcf780b687e3a40cff78b2b9640a4"
-  integrity sha512-oqb+lJ2Dl9HXI9orc6/aN8ZIAMkeThufA5iZELf2LQeBn2NtjVilF5D2w7e9RpntAzDb4jK5DsVhkfOvFY/8fg==
+"@material-ui/core@^4.12.3":
+  version "4.12.3"
+  resolved "https://registry.yarnpkg.com/@material-ui/core/-/core-4.12.3.tgz#80d665caf0f1f034e52355c5450c0e38b099d3ca"
+  integrity sha512-sdpgI/PL56QVsEJldwEe4FFaFTLUqN+rd7sSZiRCdx2E/C7z5yK0y/khAWVBH24tXwto7I1hCzNWfJGZIYJKnw==
   dependencies:
     "@babel/runtime" "^7.4.4"
     "@material-ui/styles" "^4.11.4"
-    "@material-ui/system" "^4.11.3"
+    "@material-ui/system" "^4.12.1"
     "@material-ui/types" "5.1.0"
     "@material-ui/utils" "^4.11.2"
     "@types/react-transition-group" "^4.2.0"
@@ -890,10 +890,10 @@
     jss-plugin-vendor-prefixer "^10.5.1"
     prop-types "^15.7.2"
 
-"@material-ui/system@^4.11.3":
-  version "4.11.3"
-  resolved "https://registry.yarnpkg.com/@material-ui/system/-/system-4.11.3.tgz#466bc14c9986798fd325665927c963eb47cc4143"
-  integrity sha512-SY7otguNGol41Mu2Sg6KbBP1ZRFIbFLHGK81y4KYbsV2yIcaEPOmsCK6zwWlp+2yTV3J/VwT6oSBARtGIVdXPw==
+"@material-ui/system@^4.12.1":
+  version "4.12.1"
+  resolved "https://registry.yarnpkg.com/@material-ui/system/-/system-4.12.1.tgz#2dd96c243f8c0a331b2bb6d46efd7771a399707c"
+  integrity sha512-lUdzs4q9kEXZGhbN7BptyiS1rLNHe6kG9o8Y307HCvF4sQxbCgpL2qi+gUk+yI8a2DNk48gISEQxoxpgph0xIw==
   dependencies:
     "@babel/runtime" "^7.4.4"
     "@material-ui/utils" "^4.11.2"