build: switch to C++20

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ibf6c0f96ee12a73715de30ac27d7648e6154a7ae
diff --git a/meson.build b/meson.build
index dd7433b..79f4850 100644
--- a/meson.build
+++ b/meson.build
@@ -4,10 +4,11 @@
     default_options: [
         'warning_level=3',
         'werror=true',
-        'cpp_std=c++17'
+        'cpp_std=c++20'
     ],
     license: 'Apache-2.0',
     version: '1.0',
+    meson_version: '>=0.57.0',
 )
 
 build_tests = get_option('tests')