Update files to match v3.0 branch

.github/workflows/emscripten.yaml

diff --git a/.github/workflows/emscripten.yaml b/.github/workflows/emscripten.yaml
deleted file mode 100644
index 14b2b9d..0000000
--- a/.github/workflows/emscripten.yaml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: WASM
-
-on:
-  workflow_dispatch:
-  pull_request:
-    branches:
-    - master
-    - stable
-    - v*
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build-wasm-emscripten:
-    name: Pyodide wheel
-    runs-on: ubuntu-22.04
-    steps:
-    - uses: actions/checkout@v4
-      with:
-        submodules: true
-        fetch-depth: 0
-
-    - uses: pypa/cibuildwheel@v2.20
-      env:
-        PYODIDE_BUILD_EXPORTS: whole_archive
-      with:
-        package-dir: tests
-        only: cp312-pyodide_wasm32

.github/workflows/pip.yml

diff --git a/.github/workflows/pip.yml b/.github/workflows/pip.yml
index be68a05..f7a7349 100644
--- a/.github/workflows/pip.yml
+++ b/.github/workflows/pip.yml
@@ -111,10 +111,8 @@
       uses: pypa/gh-action-pypi-publish@release/v1
       with:
         packages-dir: standard/
-        attestations: true
 
     - name: Publish global package
       uses: pypa/gh-action-pypi-publish@release/v1
       with:
         packages-dir: global/
-        attestations: true

include/pybind11/detail/common.h

diff --git a/include/pybind11/detail/common.h b/include/pybind11/detail/common.h
index cba16e1..6f3de41 100644
--- a/include/pybind11/detail/common.h
+++ b/include/pybind11/detail/common.h
@@ -503,8 +503,6 @@
         }
 
 \endrst */
-PYBIND11_WARNING_PUSH
-PYBIND11_WARNING_DISABLE_CLANG("-Wgnu-zero-variadic-macro-arguments")
 #define PYBIND11_MODULE(name, variable, ...)                                                      \
     PYBIND11_MODULE_PYINIT(                                                                       \
         name, (pybind11::detail::get_num_interpreters_seen() += 1), ##__VA_ARGS__)                \

include/pybind11/functional.h

diff --git a/include/pybind11/functional.h b/include/pybind11/functional.h
index 1b6b130..8f59f5f 100644
--- a/include/pybind11/functional.h
+++ b/include/pybind11/functional.h
@@ -9,8 +9,6 @@
 
 #pragma once
 
-#define PYBIND11_HAS_TYPE_CASTER_STD_FUNCTION_SPECIALIZATIONS
-
 #include "pybind11.h"
 
 #include <functional>

include/pybind11/typing.h

diff --git a/include/pybind11/typing.h b/include/pybind11/typing.h
index 14db47d..1715026 100644
--- a/include/pybind11/typing.h
+++ b/include/pybind11/typing.h
@@ -211,14 +211,6 @@
                                  + const_name("]");
 };
 
-template <typename Return>
-struct handle_type_name<typing::Callable<Return(ellipsis)>> {
-    // PEP 484 specifies this syntax for defining only return types of callables
-    using retval_type = conditional_t<std::is_same<Return, void>::value, void_type, Return>;
-    static constexpr auto name
-        = const_name("Callable[..., ") + make_caster<retval_type>::name + const_name("]");
-};
-
 template <typename T>
 struct handle_type_name<typing::Type<T>> {
     static constexpr auto name = const_name("type[") + make_caster<T>::name + const_name("]");

tests/test_pytypes.py

diff --git a/tests/test_pytypes.py b/tests/test_pytypes.py
index 84d44e3..a199d72 100644
--- a/tests/test_pytypes.py
+++ b/tests/test_pytypes.py
@@ -980,13 +980,6 @@
     )
 
 
-def test_fn_return_only(doc):
-    assert (
-        doc(m.annotate_fn_only_return)
-        == "annotate_fn_only_return(arg0: Callable[..., int]) -> None"
-    )
-
-
 def test_type_annotation(doc):
     assert (
         doc(m.annotate_type) == "annotate_type(arg0: type[typing.SupportsInt]) -> type"