build: update minver to iOS 14 and macOS 11

This is what UTM's minver has been for a while and will reduce
the number of warnings in the build as well as enable possible
runtime optimizations.

Author: osy

scripts/build_dependencies.sh

@@ -21,8 +21,8 @@ RED='\033[0;31m'
 NC='\033[0m'
 
 # Knobs
-IOS_SDKMINVER="11.0"
-MAC_SDKMINVER="10.11"
+IOS_SDKMINVER="14.0"
+MAC_SDKMINVER="11.0"
 VISIONOS_SDKMINVER="1.0"
 
 # Build environment