fix: revert project model changes (#5857)

Author: bepri

.github/workflows/schema.yaml

@@ -103,7 +103,3 @@ endif
 # If additional build dependencies need installing in order to build the linting env.
 .PHONY: install-lint-build-deps
 install-lint-build-deps:
-
-.PHONY: schema
-schema: install-uv
-	uv run tools/schema.py > schema/snapcraft.json

Makefile

@@ -149,6 +149,12 @@ Snapcraft 8.13.0
 - `#5704`_ Linter results will now always report the highest severity detected, rather
   than the most recently seen severity.
 
+Snapcraft 8.13.1
+~~~~~~~~~~~~~~~~
+
+- `#5843`_ The changes to the project model parsing from Snapcraft 8.13.0 have been
+  reverted to give more time for testing.
+
 
 Contributors
 ------------
@@ -175,3 +181,4 @@ release.
 .. _#5789: https://github.com/canonical/snapcraft/issues/5789
 .. _#5794: https://github.com/canonical/snapcraft/issues/5794
 .. _#5704: https://github.com/canonical/snapcraft/issues/5704
+.. _#5843: https://github.com/canonical/snapcraft/issues/5843