fix bazel registry branch reference

platform/external/bazelbuild-bazel-central-registry by now has a valid
`main` branch and hence we can fix this little inconsistency of having a
main-kernel branch where main would be absolutely fine.

Change-Id: I53ec8072c2d1c86c248dd24906ca00828e1a7476
Signed-off-by: Matthias Maennich <maennich@google.com>
diff --git a/default.xml b/default.xml
index 15b6224..2542ae4 100644
--- a/default.xml
+++ b/default.xml
@@ -35,7 +35,7 @@
 
   <!-- deps for for bzlmod -->
   <project path="external/bazel-skylib" name="platform/external/bazel-skylib" groups="ddk-external" />
-  <project path="external/bazelbuild-bazel-central-registry" name="platform/external/bazelbuild-bazel-central-registry" revision="main-kernel" groups="ddk-external" />
+  <project path="external/bazelbuild-bazel-central-registry" name="platform/external/bazelbuild-bazel-central-registry" groups="ddk-external" />
   <project path="external/bazelbuild-platforms" name="platform/external/bazelbuild-platforms" groups="ddk-external" />
   <project path="external/bazelbuild-apple_support" name="platform/external/bazelbuild-apple_support" groups="ddk-external" />
   <project path="external/bazelbuild-rules_cc" name="platform/external/bazelbuild-rules_cc" groups="ddk-external" />