snapcraft: fix broken test from mismatched dep

We're using a later version of `craft-cli` than
snapcraft is expecting, and thus one of the
error message strings that is tested for has
changed slightly - this patch corrects that
and can be dropped when snapcraft adopts a later
version of `craft-cli`.

pkgs/by-name/sn/snapcraft/esm-test.patch

@@ -0,0 +1,14 @@
+diff --git i/tests/unit/test_application.py w/tests/unit/test_application.py
+index d5da2454c..2a9bcd6f9 100644
+--- i/tests/unit/test_application.py
++++ w/tests/unit/test_application.py
+@@ -391,7 +391,8 @@ def test_esm_error(snapcraft_yaml, base, monkeypatch, capsys):
+     _, err = capsys.readouterr()
+ 
+     assert re.match(
+-        rf"^Base {base!r} is not supported by this version of Snapcraft.\n"
++        rf"^Running snapcraft without a command will not be possible in future releases. Use 'snapcraft pack' instead.\n"
++        rf"Base {base!r} is not supported by this version of Snapcraft.\n"
+         rf"Recommended resolution: Use Snapcraft .* from the '.*' channel of snapcraft where {base!r} was last supported.\n"
+         r"For more information, check out: .*/reference/bases\n",
+         err,

pkgs/by-name/sn/snapcraft/package.nix

@@ -26,6 +26,12 @@ python312Packages.buildPythonApplication rec {
   };
 
   patches = [
+    # We're using a later version of `craft-cli` than expected, which
+    # adds an extra deprecation warning to the CLI output, meaning that
+    # an expected error message looks slightly different. This patch corrects
+    # that by checking for the updated error message and can be dropped in a
+    # later release of snapcraft.
+    ./esm-test.patch
     # Snapcraft is only officially distributed as a snap, as is LXD. The socket
     # path for LXD must be adjusted so that it's at the correct location for LXD
     # on NixOS. This patch will likely never be accepted upstream.