Bump bootstrap-sass from 3.3.7 to 3.4.1

Bumps [bootstrap-sass](https://github.com/twbs/bootstrap-sass) from 3.3.7 to 3.4.1.
- [Release notes](https://github.com/twbs/bootstrap-sass/releases)
- [Changelog](https://github.com/twbs/bootstrap-sass/blob/master/CHANGELOG.md)
- [Commits](twbs/bootstrap-sass@v3.3.7...v3.4.1)

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

package.json

@@ -11,7 +11,7 @@
     },
     "devDependencies": {
         "axios": "^0.18",
-        "bootstrap-sass": "^3.3.7",
+        "bootstrap-sass": "^3.4.1",
         "cross-env": "^5.1",
         "jquery": "^3.2",
         "laravel-mix": "^2.0",

yarn.lock

@@ -1099,10 +1099,10 @@ boom@5.x.x:
   dependencies:
     hoek "4.x.x"
 
-bootstrap-sass@^3.3.7:
-  version "3.3.7"
-  resolved "https://registry.yarnpkg.com/bootstrap-sass/-/bootstrap-sass-3.3.7.tgz#6596c7ab40f6637393323ab0bc80d064fc630498"
-  integrity sha1-ZZbHq0D2Y3OTMjqwvIDQZPxjBJg=
+bootstrap-sass@^3.4.1:
+  version "3.4.1"
+  resolved "https://registry.yarnpkg.com/bootstrap-sass/-/bootstrap-sass-3.4.1.tgz#6843c73b1c258a0ac5cb2cc6f6f5285b664a8e9a"
+  integrity sha512-p5rxsK/IyEDQm2CwiHxxUi0MZZtvVFbhWmyMOt4lLkA4bujDA1TGoKT0i1FKIWiugAdP+kK8T5KMDFIKQCLYIA==
 
 brace-expansion@^1.1.7:
   version "1.1.11"