Update .gitignore to new `dart_tool` pub cache
dart-lang/sdkdart-lang/http_multi_server#32030
diff --git a/pkgs/http_multi_server/.gitignore b/pkgs/http_multi_server/.gitignore
index 7dbf035..ab3cb76 100644
--- a/pkgs/http_multi_server/.gitignore
+++ b/pkgs/http_multi_server/.gitignore
@@ -1,5 +1,6 @@
# Don’t commit the following directories created by pub.
.buildlog
+.dart_tool/
.pub/
build/
packages
@@ -12,4 +13,4 @@
*.js.map
# Include when developing application packages.
-pubspec.lock
\ No newline at end of file
+pubspec.lock