feat: tweak browserslist to iOS >= 15

.browserslistrc

@@ -1,13 +1,14 @@
 # This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
+
 # For additional information regarding the format and rule options, please see:
-# https://github.com/browserslist/browserslist#queries
 
+# https://github.com/browserslist/browserslist#queries
 
 # You can see what browsers were selected by your queries by running:
-#   npx browserslist
 
-IOS >= 13
-Safari >= 13
+# npx browserslist
+
+IOS >= 15
+Safari >= 15
 last 5 Chrome versions
 last 5 Firefox versions
-Samsung >= 12