build: switch to C++20

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic4293a225b9fa30c358e79c095a9c27da97147a1
diff --git a/meson.build b/meson.build
index bc4f1a1..1c5808d 100644
--- a/meson.build
+++ b/meson.build
@@ -2,9 +2,9 @@
   'phosphor-ipmi-blobs',
   'cpp',
   version: '0.1',
-  meson_version: '>=0.51.0',
+  meson_version: '>=0.57.0',
   default_options: [
-    'cpp_std=c++17',
+    'cpp_std=c++20',
     'warning_level=3',
     'werror=true',
   ])