CI: Remove broken Linux Mint and openSUSE runs

Author: tobiasdiez

.github/workflows/docker.yml

@@ -23,20 +23,13 @@ on:
            "ubuntu-jammy",
            "debian-bullseye",
            "debian-bookworm",
-           "linuxmint-20.2",
-           "linuxmint-20.3",
-           "linuxmint-21",
-           "linuxmint-21.1",
-           "linuxmint-21.2",
-           "linuxmint-21.3",
            "fedora-40",
            "fedora-41",
            "centos-stream-9",
            "centos-stream-9-python3.12",
            "almalinux-9-python3.11",
            "archlinux-latest",
            "opensuse-15.5-gcc_11-python3.11",
-           "opensuse-tumbleweed-python3.10",
            "opensuse-tumbleweed",
           ]
         # 'tox -e update_docker_platforms' updates above