CMake: Bump almost all cmake_minimum_required calls to 3.16

Needed for subsequent change that will check and error out if the
version is lower than 3.16. We do that to ensure all policies
introduced by CMake up to version 3.16 have their behavior set to
NEW.

Pick-to: 6.2
Task-number: QTBUG-95018
Change-Id: I874f5f7560eb5817b5f2582d09d6dce7f7e54d2d
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.15.0)
+cmake_minimum_required(VERSION 3.16)
 
 include(.cmake.conf)
 project(QtConnectivity

config.tests/bluez/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14.0)
+cmake_minimum_required(VERSION 3.16)
 project(config_test_bluez LANGUAGES C CXX)
 
 foreach(p ${QT_CONFIG_COMPILE_TEST_PACKAGES})

config.tests/bluez_le/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14.0)
+cmake_minimum_required(VERSION 3.16)
 project(config_test_bluez_le LANGUAGES C CXX)
 
 foreach(p ${QT_CONFIG_COMPILE_TEST_PACKAGES})

config.tests/linux_crypto_api/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14.0)
+cmake_minimum_required(VERSION 3.16)
 project(config_test_linux_crypto_api LANGUAGES C CXX)
 
 foreach(p ${QT_CONFIG_COMPILE_TEST_PACKAGES})

config.tests/winrt_bt/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14.0)
+cmake_minimum_required(VERSION 3.16)
 project(config_test_winrt LANGUAGES C CXX)
 
 foreach(p ${QT_CONFIG_COMPILE_TEST_PACKAGES})

tests/auto/cmake/CMakeLists.txt

@@ -6,7 +6,7 @@
 #    `$qt_prefix/bin/qt-cmake ..` or `cmake -DCMAKE_PREFIX_PATH=/path/to/qt ..`
 # 4) ctest         # Run ctest
 
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.16)
 project(connectivity_cmake_tests)
 enable_testing()