devel::dune: bump to v3.21.0

Author: Marc Kewitz

recipes/devel/dune.yaml

@@ -1,7 +1,7 @@
 inherit: [cpackage, make]
 
 metaEnvironment:
-    PKG_VERSION: "3.17.2"
+    PKG_VERSION: "3.21.0"
     PKG_LICENSE: "MIT"
 
 depends:
@@ -13,7 +13,7 @@ depends:
 checkoutSCM:
     scm: url
     url: https://github.com/ocaml/dune/archive/refs/tags/${PKG_VERSION}.tar.gz
-    digestSHA256: 1b45e34d1eacf40be569e4d7ad055508a3242637b098327c91f7ce67772a1889
+    digestSHA256: 07c7dbd778579e35f365320b559d6f781cd755c6485b164b802f109fe21ead68
     stripComponents: 1
 
 multiPackage: