Update .github/workflows/pr.yaml

Author: ajschmidt8

.github/workflows/pr.yaml

@@ -41,7 +41,7 @@ jobs:
     with:
       build_type: pull-request
       # Package is pure Python and only ever requires one build.
-      matrix_filter: 'map(select((.LINUX_VER | test("centos")|not))) | sort_by((.PY_VER | split(".") | map(tonumber))) | .[-1] + {ARCH: "amd64"}'
+      matrix_filter: 'map(select((.LINUX_VER | test("centos")|not))) | sort_by((.PY_VER | split(".") | map(tonumber))) | [.[-1] + {ARCH: "amd64"}]'
       script: "ci/build_wheel.sh"
   wheel-tests:
     needs: wheel-build