Bump CMake policy version to avoid deprecation warning (#1499) Starting with CMake 3.27, there will be a warning for compat levels below CMake 3.5. Co-authored-by: Jordan Bayles <bayles.jordan@gmail.com>

diff --git a/jsoncppConfig.cmake.in b/jsoncppConfig.cmake.in
index 76570bc..fdd9fea 100644
--- a/jsoncppConfig.cmake.in
+++ b/jsoncppConfig.cmake.in

@@ -1,5 +1,5 @@
 cmake_policy(PUSH)
-cmake_policy(VERSION 3.0)
+cmake_policy(VERSION 3.0...3.26)
 
 @PACKAGE_INIT@