python-pluggy: bump to 1.6.0

Required by python-pytest >= 9.0.0, which needs pluggy >= 1.5.0.

v1.5.0 added support for deprecating specific hook parameters via
warn_on_impl_args (used by pytest 9.x hookspecs). Without this,
pytest fails to import with:
  TypeError: HookspecMarker.__call__() got an unexpected keyword
  argument 'warn_on_impl_args'

v1.6.0 changes:
- Drop Python 3.8 support
- Fix regression where get_result() on a failed Result caused the
  exception traceback to grow longer on each call
- Fix StopIteration passing through hook wrappers
- Fix Python 3.14 SyntaxWarning

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-pluggy/test.sh

@@ -0,0 +1,47 @@
+#!/bin/sh
+
+[ "$1" = "python3-pluggy" ] || exit 0
+
+python3 - << EOF
+import sys
+import pluggy
+
+version = pluggy.__version__
+if version != "$2":
+    print("Wrong version: " + version)
+    sys.exit(1)
+
+# Define a hookspec and hookimpl
+hookspec = pluggy.HookspecMarker("myproject")
+hookimpl = pluggy.HookimplMarker("myproject")
+
+class MySpec:
+    @hookspec
+    def my_hook(self, arg):
+        """A hook that returns a value."""
+
+class MyPlugin:
+    @hookimpl
+    def my_hook(self, arg):
+        return arg * 2
+
+# Register and call
+pm = pluggy.PluginManager("myproject")
+pm.add_hookspecs(MySpec)
+pm.register(MyPlugin())
+
+results = pm.hook.my_hook(arg=21)
+assert results == [42], f"Expected [42], got {results}"
+
+# Multiple plugins, results collected in LIFO order
+class AnotherPlugin:
+    @hookimpl
+    def my_hook(self, arg):
+        return arg + 1
+
+pm.register(AnotherPlugin())
+results = pm.hook.my_hook(arg=10)
+assert results == [11, 20], f"Expected [11, 20], got {results}"
+
+sys.exit(0)
+EOF