Require iOS 13.0 in ya make builds

As announced [in Atushka](https://clubs.at.yandex-team.ru/arcadia/29463).

build/ymake_conf.py

@@ -1165,15 +1165,7 @@ class GnuToolchain(Toolchain):
                 self.env.setdefault(lib_path, []).append('{}/lib'.format(self.tc.name_marker))
 
         macos_version_min = '11.0'
-        ios_version_min = '11.0'
-        # min ios simulator version for Metal App is 13.0
-        # https://developer.apple.com/documentation/metal/supporting_simulator_in_a_metal_app
-        # Mapkit (MAPSMOBI_BUILD_TARGET) uses Metal Framework
-        if preset('MAPSMOBI_BUILD_TARGET') and target.is_iossim and target.is_armv8:
-            ios_version_min = '13.0'
-        # Mapkit uses SecTrustEvaluateWithError function and these are min versions for it
-        elif preset('MAPSMOBI_BUILD_TARGET'):
-            ios_version_min = '12.0'
+        ios_version_min = '13.0'
 
         swift_target = select(default=None, selectors=[
             (target.is_iossim and target.is_x86_64, 'x86_64-apple-ios{}-simulator'.format(ios_version_min)),