Use FindPython3 when cmake version >= 3.15.0

Signed-off-by: okhowang(王沛文) <okhowang@tencent.com>
diff --git a/ChangeLog.d/use-find-python3-cmake.txt b/ChangeLog.d/use-find-python3-cmake.txt
new file mode 100644
index 0000000..36a5171
--- /dev/null
+++ b/ChangeLog.d/use-find-python3-cmake.txt
@@ -0,0 +1,2 @@
+Changes
+  * Use FindPython3 when cmake version >= 3.15.0