Update dependency autoprefixer to v10.3.4

package.json

@@ -44,7 +44,7 @@
     "bugs": "https://github.com/TryGhost/Tribeca/issues",
     "contributors": "https://github.com/TryGhost/Tribeca/graphs/contributors",
     "devDependencies": {
-        "autoprefixer": "10.3.3",
+        "autoprefixer": "10.3.4",
         "beeper": "2.1.0",
         "cssnano": "5.0.8",
         "gscan": "4.1.4",

yarn.lock

@@ -473,10 +473,10 @@ atob@^2.1.2:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-[email protected].3:
-  version "10.3.3"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-10.3.3.tgz#4bac89c74ef98e6a40fe1c5b76c0d1c91db153ce"
-  integrity sha512-yRzjxfnggrP/+qVHlUuZz5FZzEbkT+Yt0/Df6ScEMnbbZBLzYB2W0KLxoQCW+THm1SpOsM1ZPcTHAwuvmibIsQ==
+[email protected].4:
+  version "10.3.4"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-10.3.4.tgz#29efe5d19f51c281953178ddb5b84c5f1ca24c86"
+  integrity sha512-EKjKDXOq7ug+jagLzmnoTRpTT0q1KVzEJqrJd0hCBa7FiG0WbFOBCcJCy2QkW1OckpO3qgttA1aWjVbeIPAecw==
   dependencies:
     browserslist "^4.16.8"
     caniuse-lite "^1.0.30001252"