start working on next version, fix release process instructions

docs/release.rst

@@ -4,12 +4,15 @@ How to make a new release?
 1. Ensure that the full version of nanobind is checked out (including the
    ``robin_map`` submodule)
 
-2. Update version in ``src/__init__.py`` and ``include/nanobind/nanobind.h``:
+2. Update version in ``src/__init__.py``, ``include/nanobind/nanobind.h``,
+   and ``pyproject.toml``:
 
    Also:
 
-   - Remove ``dev1`` suffix from ``X.Y.Zdev1`` in ``src/__init__.py``
-   - Set ``NB_VERSION_DEV`` to ``0``.
+   - Remove ``dev1`` suffix from ``X.Y.Zdev1`` in ``src/__init__.py`` and
+     ``pyproject.toml``.
+
+   - Set ``NB_VERSION_DEV`` to ``0`` in ``include/nanobind/nanobind.h``.
 
 3. Add release date to ``docs/changelog.rst``.
 
@@ -29,5 +32,7 @@ How to make a new release?
 
 10. Update version in ``src/__init__.py`` and ``include/nanobind/nanobind.h``:
 
-   - Append ``dev1`` suffix from ``X.Y.Zdev1`` in ``src/__init__.py``
-   - Set ``NB_VERSION_DEV`` to ``1``.
+   - Append ``dev1`` suffix from ``X.Y.Zdev1`` in ``src/__init__.py`` and
+     ``pyproject.toml``.
+
+   - Set ``NB_VERSION_DEV`` to ``1`` in ``include/nanobind/nanobind.h``

include/nanobind/nanobind.h

@@ -22,9 +22,9 @@
 #endif
 
 #define NB_VERSION_MAJOR 2
-#define NB_VERSION_MINOR 1
+#define NB_VERSION_MINOR 2
 #define NB_VERSION_PATCH 0
-#define NB_VERSION_DEV   0 // A value > 0 indicates a development release
+#define NB_VERSION_DEV   1 // A value > 0 indicates a development release
 
 // Core C++ headers that nanobind depends on
 #include <cstdint>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "nanobind"
-version = "2.1.0"
+version = "2.2.0dev1"
 description = "nanobind: tiny and efficient C++/Python bindings"
 readme.content-type = "text/markdown"
 readme.text = """

src/__init__.py

@@ -12,7 +12,7 @@ def cmake_dir() -> str:
     "Return the path to the nanobind CMake module directory."
     return os.path.join(os.path.abspath(os.path.dirname(__file__)), "cmake")
 
-__version__ = "2.1.0"
+__version__ = "2.2.0dev1"
 
 __all__ = (
     "__version__",