Bump shelf from 1.3.2 to 1.4.0 in /auto_submit (#2154)

diff --git a/auto_submit/pubspec.lock b/auto_submit/pubspec.lock
index d39f4a3..4d3f0f5 100644
--- a/auto_submit/pubspec.lock
+++ b/auto_submit/pubspec.lock
@@ -518,7 +518,7 @@
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.2"
+    version: "1.4.0"
   shelf_packages_handler:
     dependency: transitive
     description:
diff --git a/auto_submit/pubspec.yaml b/auto_submit/pubspec.yaml
index c93b46d..4ff3e11 100644
--- a/auto_submit/pubspec.yaml
+++ b/auto_submit/pubspec.yaml
@@ -22,7 +22,7 @@
   json_annotation: ^4.7.0
   meta: ^1.8.0
   neat_cache: ^2.0.2
-  shelf: ^1.3.2
+  shelf: ^1.4.0
   shelf_router: ^1.1.3
   crypto: ^3.0.2
   logging: ^1.0.2