Rev cmake minimum version from 3.14.2 to 3.14.5

iOS requires 3.14.5 version and we have a special case for it. Since this is a minor version difference, and no distro is particularly providing cmake 3.14.2 package, it is safe to update to 3.14.5 to cover our supported platform matrix.

Discussion: dotnet/runtime#33959 (comment)
Fixes: dotnet/runtime#33976

cc @akoeplinger, @jkotas

mono/btls/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8.10)
+cmake_minimum_required (VERSION 3.14.5)
 
 project (mono-btls)
 
@@ -129,4 +129,4 @@ endif ()
 
 if (CYGWIN)
 	target_link_libraries (mono-btls-shared wsock32 ws2_32)
-endif ()
+endif ()