don't always test xtasks (#74)

Author: MusicalNinjaDad

Cargo.toml

@@ -31,7 +31,6 @@ autocfg = {workspace = true }
 
 [workspace]
 members = ["tests/compilation", "xtask"]
-default-members = [".", "xtask"]
 
 [workspace.dependencies]
 try_v2 = { path = "."}