python314Packages.argh: fix build failure

python3.14 introduced a breaking change which caused a test to fail. A
fix has been commited upstream in a pull request by the author, but has
since been kept unmerged

patch created with:
```
wget https://github.com/neithere/argh/pull/240/commits/699568ad674c5ea26d361202c386a8a8a82ec8ad.patch
filterdiff -i a/tests/test_integration.py -i b/tests/test_integration.py 699568ad674c5ea26d361202c386a8a8a82ec8ad.patch > pkgs/development/python-modules/argh/pr240-699568ad-06-01-2025-test_integration.patch
```

pkgs/development/python-modules/argh/default.nix

@@ -18,6 +18,14 @@ buildPythonPackage rec {
     hash = "sha256-8wAj2L4Uyl7msbPuq4KRUde72kZK4H3E3VNHkZxYkvk=";
   };
 
+  patches = [
+    # python3.14 introduced a breaking change which caused a test to fail. A
+    # fix has been commited upstream in a pull request by the author, but has
+    # since been kept unmerged
+    # https://github.com/neithere/argh/pull/240
+    ./pr240-699568ad-06-01-2025-test_integration.patch
+  ];
+
   nativeBuildInputs = [ flit-core ];
 
   nativeCheckInputs = [

pkgs/development/python-modules/argh/pr240-699568ad-06-01-2025-test_integration.patch

@@ -0,0 +1,57 @@
+diff --git a/tests/test_integration.py b/tests/test_integration.py
+index 8839265..6fc8a17 100644
+--- a/tests/test_integration.py
++++ b/tests/test_integration.py
+@@ -17,7 +17,7 @@
+ from argh.utils import unindent
+ 
+ from .base import CmdResult as R
+-from .base import DebugArghParser, get_usage_string, run
++from .base import DebugArghParser, run
+ 
+ if sys.version_info < (3, 10):
+     HELP_OPTIONS_LABEL = "optional arguments"
+@@ -796,11 +796,17 @@ def func():
+     parser = DebugArghParser()
+     parser.set_default_command(func)
+ 
+-    assert unindent(func.__doc__) in parser.format_help()
++    docstring = func.__doc__
++    assert docstring
++    assert unindent(docstring) in parser.format_help()
+ 
+ 
+ def test_prog(capsys: pytest.CaptureFixture[str]):
+-    "Program name propagates from sys.argv[0]"
++    """
++    Program name propagates to the usage string.
++    It's not just sys.argv[0], the logic is a bit more complicated in argparse,
++    so we just reuse whatever it has produced.
++    """
+ 
+     def cmd(*, foo=1):
+         return foo
+@@ -808,10 +814,12 @@ def cmd(*, foo=1):
+     parser = DebugArghParser()
+     parser.add_commands([cmd])
+ 
+-    usage = get_usage_string()
++    usage = f"usage: {parser.prog} [-h]"
+ 
+-    assert run(parser, "-h", exit=True) == 0
++    exit_code = run(parser, "-h", exit=True)
+     captured = capsys.readouterr()
++
++    assert exit_code == 0
+     assert captured.out.startswith(usage)
+ 
+ 
+@@ -822,8 +830,6 @@ def cmd(*, foo=1):
+     parser = DebugArghParser()
+     parser.set_default_command(cmd)
+ 
+-    get_usage_string("[-f FOO]")
+-
+     assert run(parser, "--foo 1") == R(out="1\n", err="")
+     assert run(parser, "--bar 1", exit=True) == "unrecognized arguments: --bar 1"
+     assert run(parser, "--bar 1", exit=False, kwargs={"skip_unknown_args": True}) == R(