DEPS: Upgrade Deps for Python 3.10

pyproject.toml

@@ -4,18 +4,25 @@
 requires = [
     "setuptools>=51.0.0",
     "wheel",
-    "Cython>=0.29.21,<3",  # Note: sync with setup.py
+    "Cython>=0.29.24,<3",  # Note: sync with setup.py
     # Numpy requirements for different OS/architectures
-    # Copied from https://github.com/scipy/scipy/blob/master/pyproject.toml (which is also licensed under BSD)
+    # Adapted from https://github.com/scipy/scipy/blob/master/pyproject.toml (which is also licensed under BSD)
     "numpy==1.17.3; python_version=='3.7' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64'",
     "numpy==1.18.3; python_version=='3.8' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64'",
-    "numpy==1.19.3; python_version>='3.9' and (platform_machine!='arm64' or platform_system!='Darwin')",
+    "numpy==1.19.3; python_version=='3.9' and (platform_machine!='arm64' or platform_system!='Darwin')",
     # Aarch64(Python 3.9 requirements are the same as AMD64)
     "numpy==1.19.2; python_version=='3.7' and platform_machine=='aarch64'",
     "numpy==1.19.2; python_version=='3.8' and platform_machine=='aarch64'",
     # Darwin Arm64
-    "numpy>=1.20.0; python_version=='3.8' and platform_machine=='arm64' and platform_system=='Darwin'",
-    "numpy>=1.20.0; python_version=='3.9' and platform_machine=='arm64' and platform_system=='Darwin'"
+    "numpy==1.20.0; python_version=='3.8' and platform_machine=='arm64' and platform_system=='Darwin'",
+    "numpy==1.20.0; python_version=='3.9' and platform_machine=='arm64' and platform_system=='Darwin'",
+    # For Python versions which aren't yet officially supported,
+    # we specify an unpinned NumPy which allows source distributions
+    # to be used and allows wheels to be used as soon as they
+    # become available.
+    "numpy==1.21.2; python_version=='3.10'",
+    "numpy; python_version>'3.10'",
+    "numpy; python_version>='3.8' and platform_python_implementation=='PyPy'",
 ]
 # uncomment to enable pep517 after versioneer problem is fixed.
 # https://github.com/python-versioneer/python-versioneer/issues/193

setup.cfg

@@ -21,6 +21,7 @@ classifiers =
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Topic :: Scientific/Engineering
 project_urls =
     Bug Tracker = https://github.com/pandas-dev/pandas/issues

setup.py

@@ -37,7 +37,7 @@ def is_platform_mac():
     return sys.platform == "darwin"
 
 
-min_cython_ver = "0.29.21"  # note: sync with pyproject.toml
+min_cython_ver = "0.29.24"  # note: sync with pyproject.toml
 
 try:
     from Cython import (