fix: test the new setup labels and skip 3.8 builds

The site tests read the SHARE drive label and the line-mode wording
from the source, and the pack-systems test needs generate_pack.py,
which needs Python 3.9.

tests/test_install_tui.py

@@ -7207,6 +7207,8 @@ class AuditSeventeenAndTen(unittest.TestCase):
 
     # tui_audit_10 P2-4: a pack's own list records its systems.
 
+    @unittest.skipIf(sys.version_info < (3, 9),
+                     "generate_pack.py's context managers need Python 3.9")
     def test_a_pack_records_the_systems_of_its_files(self):
         sys.path.insert(0, str(REPO_ROOT / "scripts"))
         self.addCleanup(sys.path.remove, str(REPO_ROOT / "scripts"))

tests/test_site_r4_merge.py

@@ -182,7 +182,8 @@ class FaqInstallsFromWhatYouHold(unittest.TestCase):
             with self.subTest(card=name):
                 self.assertIn(name, known)
         source = (REPO_ROOT / "install.py").read_text(encoding="utf-8")
-        self.assertIn('f"{card[2]} SD card ({_mount_name(mount)})"', source)
+        self.assertIn('f"{card[2]} {kind} ({_mount_name(mount)})"', source)
+        self.assertIn('else "SD card"', source)
 
     def test_a_wiped_card_links_the_copy(self):
         section = self._section("Lost or wiped card?")

tests/test_site_r5_wiki.py

@@ -65,7 +65,7 @@ class NoSetupFoundGivesEachSystemItsFolder(unittest.TestCase):
 
     def test_the_label_is_the_installer_message(self):
         self.assertIn("**`No supported platform detected`:**", self.section)
-        self.assertIn('print("  No supported platform detected.")', INSTALL_PY)
+        self.assertIn('else "  No supported platform detected.")', INSTALL_PY)
 
     def test_the_lead_names_the_menu(self):
         self.assertIn("Not sure? Open RetroArch's **Settings > Directory > System/BIOS**",