Fixed the version of numpy for linux aarch64 and python3.6

pyproject.toml

@@ -2,8 +2,9 @@
 requires = [
   "setuptools", "wheel", "scikit-build", "cmake", "pip",
   "numpy==1.13.3; python_version=='3.6' and platform_machine != 'aarch64' and platform_machine != 'arm64'",
-  "numpy==1.21.2; python_version>='3.6' and sys_platform == 'linux' and platform_machine == 'aarch64'",
+  "numpy==1.19.3; python_version=='3.6' and sys_platform == 'linux' and platform_machine == 'aarch64'",
   "numpy==1.21.2; python_version>='3.6' and sys_platform == 'darwin' and platform_machine == 'arm64'",
+  "numpy==1.21.2; python_version>='3.7' and sys_platform == 'linux' and platform_machine == 'aarch64'",
   "numpy==1.14.5; python_version=='3.7' and platform_machine != 'aarch64' and platform_machine != 'arm64'",
   "numpy==1.17.3; python_version=='3.8' and platform_machine != 'aarch64' and platform_machine != 'arm64'",
   "numpy==1.21.2; python_version>='3.9' and platform_machine != 'aarch64' and platform_machine != 'arm64'",

setup.py

@@ -35,7 +35,7 @@ def main():
 
     # linux arm64 is a special case
     if sys.platform.startswith("linux") and sys.version_info[:2] >= (3, 6) and platform.machine() == "aarch64":
-        minimum_supported_numpy = "1.21.2"
+        minimum_supported_numpy = "1.19.3"
 
     # macos arm64 is a special case
     if sys.platform == "darwin" and sys.version_info[:2] >= (3, 6) and platform.machine() == "arm64":