tutorial stack: allow deprecated versions (#30648)

For tutorial builds, we should continue to allow deprecated builds to be installed. We
can update them as needed when we update the tutorial, but we don't need to correct them
immediately on deprecation in CI.

- [x] add `deprecated:true` to tutorial `spack.yaml` config.

share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml

@@ -9,6 +9,9 @@ spack:
       projections:
         all: '{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'
 
+    # allow deprecated versions in concretizations
+    deprecated: true
+
   packages:
     all:
       target: [x86_64]