CI: add proj-bin to have cs2cs for tests (#1410)

Some tests use m.proj which requires cs2cs

.github/workflows/apt.txt

@@ -11,6 +11,7 @@ libnetcdf-dev
 libopenblas-dev
 libpng-dev
 libproj-dev
+proj-bin
 libreadline-dev
 libzstd-dev
 python3-dateutil