Remove armv7 and ppc64le matrix entries

Delete the armv7 and ppc64le runner targets from the publish_test_pypi workflow matrix in .github/workflows/publish_test_pypi.yml. This simplifies the CI matrix by removing the two Ubuntu-based architecture entries.

Author: JR-1991

.github/workflows/publish_test_pypi.yml

@@ -27,10 +27,6 @@ jobs:
             target: x86
           - runner: ubuntu-latest
             target: aarch64
-          - runner: ubuntu-latest
-            target: armv7
-          - runner: ubuntu-latest
-            target: ppc64le
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5