Upgrade flit in devel-common (apache#48364)

Author: potiuk

devel-common/pyproject.toml

@@ -16,7 +16,7 @@
 # under the License.
 
 [build-system]
-requires = ["flit_core==3.11.0"]
+requires = ["flit_core==3.12.0"]
 build-backend = "flit_core.buildapi"
 
 [project]