bump-version: use cargo update instead of cargo check

We don't actually need to check; we just need to update version numbers.

bin/bump-version

@@ -51,6 +51,6 @@ fi
 
 rm -f src/{clusterd,environmentd,persist-client,testdrive,catalog-debug,balancerd}/Cargo.toml.bak LICENSE.bak
 
-cargo check
+cargo update --workspace
 
 git commit -am "release: bump to version v$version"