Update dependency bazel_gazelle to v0.40.0

Author: renovate[bot]

WORKSPACE

@@ -26,10 +26,10 @@ http_archive(
 
 http_archive(
     name = "bazel_gazelle",
-    sha256 = "b760f7fe75173886007f7c2e616a21241208f3d90e8657dc65d36a771e916b6a",
+    sha256 = "a80893292ae1d78eaeedd50d1cab98f242a17e3d5741b1b9fb58b5fd9d2d57bc",
     urls = [
-        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.39.1/bazel-gazelle-v0.39.1.tar.gz",
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.39.1/bazel-gazelle-v0.39.1.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.40.0/bazel-gazelle-v0.40.0.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.40.0/bazel-gazelle-v0.40.0.tar.gz",
     ],
 )