GH-45508: [CI][R] Remove Ubuntu version from sanitizer jobs · apache/arrow@232f0ea

Canceling since a higher priority waiting request for 'apache/arrow-ci-r-sanitizer-R' exists

The operation was canceled.

Cache not found for keys: r-40-ccache-mingw-ucrt64-9262fb6f1dea1a2d0fa2e408bdcfe7f25e3818d04a2770122752155f48ef32d6-13320472864, r-40-ccache-mingw-ucrt64-9262fb6f1dea1a2d0fa2e408bdcfe7f25e3818d04a2770122752155f48ef32d6-, r-40-ccache-mingw-ucrt64-