Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: dart 0 -> 1
attrpath: dart
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/8p22j649jbcwinqxxkff9jdmmxb8bbaz-packages.json.drv
building '/nix/store/8p22j649jbcwinqxxkff9jdmmxb8bbaz-packages.json.drv'...

Going to be running update for following packages:
 - dart-3.10.7

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - dart-3.10.7: UPDATING ...
 - dart-3.10.7: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/compilers/dart/sources.nix b/pkgs/development/compilers/dart/sources.nix
index 7ca6da8b86b1..d750f9b48dd0 100644
--- a/pkgs/development/compilers/dart/sources.nix
+++ b/pkgs/development/compilers/dart/sources.nix
@@ -1,23 +1,23 @@
 let
-  version = "3.10.7";
+  version = "3.10.8";
 in
 { fetchurl }:
 {
   versionUsed = version;
   "${version}-x86_64-darwin" = fetchurl {
     url = "https://storage.googleapis.com/dart-archive/channels/stable/release/${version}/sdk/dartsdk-macos-x64-release.zip";
-    hash = "sha256-EES4leNoHZWFs/nQUJTzN+cCKGzxiANpLJrkXb1UKdA=";
+    hash = "sha256-EwLryZDVKeq+IjPzedwRcXR3Qtu3HcgYBIocLAWbZSc=";
   };
   "${version}-aarch64-darwin" = fetchurl {
     url = "https://storage.googleapis.com/dart-archive/channels/stable/release/${version}/sdk/dartsdk-macos-arm64-release.zip";
-    hash = "sha256-ovQkvU5BpqXHUlUebUKKranJUERhZPsAsfO3N+4jzKs=";
+    hash = "sha256-vQ4yOB1I97w0AyCaQR2CxffI8b2I6S8MTzkr9G68Dg8=";
   };
   "${version}-aarch64-linux" = fetchurl {
     url = "https://storage.googleapis.com/dart-archive/channels/stable/release/${version}/sdk/dartsdk-linux-arm64-release.zip";
-    hash = "sha256-gb3NiChgaYFxPFE+PUN37u3sQxxGvzXzJ3xquvLXvVE=";
+    hash = "sha256-WE7qTFP2T+2mjrpdxLKwJCdcIQA9/M2Fp56TT6qsCSE=";
   };
   "${version}-x86_64-linux" = fetchurl {
     url = "https://storage.googleapis.com/dart-archive/channels/stable/release/${version}/sdk/dartsdk-linux-x64-release.zip";
-    hash = "sha256-ik7qz012kOAzidYygkG8aaG2HLmA8j1Q9i66y1kg7HQ=";
+    hash = "sha256-ZxIAfRYgP4kotAKADe0OkjV0Jrg7AkF9FXPbnMiLdcQ=";
   };
 }

No auto update branch exists
There might already be an open PR for this update:
- dart: 3.10.7 -> 3.10.8
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/484614"