davis: pin to php83 because php84 is broken

As per upstream's request:
https://github.com/tchapi/davis/issues/195#issuecomment-2866750216

The imap libraries have been unbundled in php 8.4 causing rippling
effects throughout the ecosystem. https://php.watch/versions/8.4/imap-unbundled

pkgs/by-name/da/davis/package.nix

@@ -27,8 +27,11 @@ php.buildComposerProject2 (finalAttrs: {
     rm -rf "$out/share"
   '';
 
-  passthru.tests = {
-    inherit (nixosTests) davis;
+  passthru = {
+    php = php;
+    tests = {
+      inherit (nixosTests) davis;
+    };
   };
 
   meta = {

pkgs/top-level/all-packages.nix

@@ -16940,4 +16940,8 @@ with pkgs;
   rustdesk-flutter = callPackage ../by-name/ru/rustdesk-flutter/package.nix {
     flutter = flutter324;
   };
+
+  davis = callPackage ../by-name/da/davis/package.nix {
+    php = php83; # https://github.com/tchapi/davis/issues/195
+  };
 }