[ci skip] update abi_migration_branches

Author: h-vetinari

conda-forge.yml

@@ -4,7 +4,7 @@ azure:
     timeoutInMinutes: 1
 bot:
   abi_migration_branches:
-  - v2.6.x
+  - v2.7.x
 build_platform:
   linux_aarch64: linux_64
   osx_arm64: osx_64