CI: simplify pattern for job artifacts

There's no -diff job which would need artifacts anymore. We've long
switched to a CI setup where the diffing job is a standalone one that
does not need access to the original dependencies anymore.

Change-Id: I8633452f5b538e95bfb145cdec7400e7f8f0cf5a
diff --git a/ci/build.sh b/ci/build.sh
index 47e20d8..41d5cc2 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -65,7 +65,7 @@
     # nothing ahead in the pipeline -> fallback to the latest promoted artifact
     DEPSRCDIR=$(jq < ~/zuul-env.json -e -r ".projects[] | select(.name == \"CzechLight/dependencies\").src_dir")
     DEP_SUBMODULE_COMMIT=$(git --git-dir ${HOME}/${DEPSRCDIR}/.git rev-parse HEAD)
-    ARTIFACT_URL="https://object-store.cloud.muni.cz/swift/v1/ci-artifacts-${ZUUL_TENANT}/${ZUUL_GERRIT_HOSTNAME}/CzechLight/dependencies/${ZUUL_JOB_NAME%%-cover?(-previous|-diff)}/${DEP_SUBMODULE_COMMIT}.tar.zst"
+    ARTIFACT_URL="https://object-store.cloud.muni.cz/swift/v1/ci-artifacts-${ZUUL_TENANT}/${ZUUL_GERRIT_HOSTNAME}/CzechLight/dependencies/${ZUUL_JOB_NAME%%-cover?(-previous)}/${DEP_SUBMODULE_COMMIT}.tar.zst"
 fi
 
 curl ${ARTIFACT_URL} | unzstd --stdout | tar -C ${PREFIX} -xf -