build: switch to C++20

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Icb621d7fce3700ab59e4d595b8c67896e7fef8b0
diff --git a/meson.build b/meson.build
index 8e659ed..2bafd48 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')