internal/rosa: add zlib runtime dependency

For transitioning to dynamically linking zlib.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/python.go

@@ -87,6 +87,7 @@ func newViaPip(
 			}
 
 			return t.New(name+"-"+version, 0, slices.Concat([]pkg.Artifact{
+				t.Load(Zlib),
 				t.Load(Python),
 			}, extraRes), nil, nil, `
 pip3 install \
@@ -112,6 +113,7 @@ func (t Toolchain) newSetuptools() (pkg.Artifact, string) {
 		checksum = "K9f8Yi7Gg95zjmQsE1LLw9UBb8NglI6EY6pQpdD6DM0Pmc_Td5w2qs1SMngTI6Jp"
 	)
 	return t.New("setuptools-"+version, 0, []pkg.Artifact{
+		t.Load(Zlib),
 		t.Load(Python),
 	}, nil, nil, `
 pip3 install \