Bump CMake requirement to 3.29 (#12556)

### Summary
Update the CMake version requirement to 3.29. This is in response to
XNNPACK implicitly requiring it.

Note that it should be sufficient to update the dependency only at the
top-level CMake (as opposed to all of the separate locations where the
version in specified).

Fixes #12524. See the issue
for more context.

### Test plan
I've built locally to verify that it builds correctly. CI will also help
validate. I also attempted to build with an older CMake version (3.28),
and observed the following error:

```
CMake Error at CMakeLists.txt:50 (cmake_minimum_required):
  CMake 3.29 or higher is required.  You are running version 3.28.0
```

Previously, it would error out with:
```
CMake Error at CMakeLists.txt:18 (CMAKE_POLICY):
  Policy "CMP0156" is not known to this version of CMake.
```

(cherry picked from commit a1b35e8)

Author: GregoryComer

CMakeLists.txt

@@ -45,7 +45,9 @@
 # ~~~
 #
 
-cmake_minimum_required(VERSION 3.24)
+# TODO Lower to 3.24 when XNNPACK dependency is updated to include
+# https://github.com/google/XNNPACK/commit/c690daa67f883e1b627aadf7684c06797e9a0684
+cmake_minimum_required(VERSION 3.29)
 project(executorch)
 
 # MARK: - Start EXECUTORCH_H12025_BUILD_MIGRATION

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-  "cmake<4.0.0",  # For building binary targets in the wheel. 4.0.0 breaks third-party CMake build so temporarily pin the version.
+  "cmake>=3.29,<4.0.0",  # For building binary targets in the wheel. 4.0.0 breaks third-party CMake build so temporarily pin the version.
   "pip>=23",  # For building the pip package.
   "pyyaml",  # Imported by the kernel codegen tools.
   "setuptools>=63",  # For building the pip package contents.

requirements-dev.txt

@@ -1,6 +1,6 @@
 # Pip packages needed to build from source. Mainly for development of ExecuTorch.
 
-cmake>=3.19, <4.0.0  # For building binary targets in the wheel.
+cmake>=3.29, <4.0.0  # For building binary targets in the wheel.
 pip>=23  # For building the pip package.
 pyyaml  # Imported by the kernel codegen tools.
 setuptools>=63  # For building the pip package contents.