package/python-gunicorn: bump to version 21.2.0

Drop python-setuptools runtime dependency.

Add new python-packaging runtime dependency.

License hash changed due to date update:
https://github.com/benoitc/gunicorn/commit/378f0d04ec390a754cb819f095bf65bfcc04ed99

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-gunicorn/Config.in

@@ -1,6 +1,6 @@
 config BR2_PACKAGE_PYTHON_GUNICORN
 	bool "python-gunicorn"
-	select BR2_PACKAGE_PYTHON_SETUPTOOLS # runtime
+	select BR2_PACKAGE_PYTHON_PACKAGING # runtime
 	select BR2_PACKAGE_PYTHON3_SSL # runtime
 	help
 	  Gunicorn 'Green Unicorn' is a Python WSGI HTTP Server for

package/python-gunicorn/python-gunicorn.hash

@@ -1,5 +1,5 @@
-# md5, sha256 from https://pypi.python.org/pypi/gunicorn/json
-md5  db8a7c5c2064000af70286534803bf1d  gunicorn-20.1.0.tar.gz
-sha256  e0a968b5ba15f8a328fdfd7ab1fcb5af4470c28aaf7e55df02a99bc13138e6e8  gunicorn-20.1.0.tar.gz
-# Locally computed sha256
-sha256  789fe11b92e1cabfbcf744b5fcc392c9bd5c6798603a4e89f925b6337984d1df  LICENSE
+# md5, sha256 from https://pypi.org/pypi/gunicorn/json
+md5  cb41319d6929842c5af7003d48c513a2  gunicorn-21.2.0.tar.gz
+sha256  88ec8bff1d634f98e61b9f65bc4bf3cd918a90806c6f5c48bc5603849ec81033  gunicorn-21.2.0.tar.gz
+# Locally computed sha256 checksums
+sha256  fc71b8f2ce774a47090c106ac5d1145359f5c0e25a0d9ab42acacd230f596936  LICENSE

package/python-gunicorn/python-gunicorn.mk

@@ -4,9 +4,9 @@
 #
 ################################################################################
 
-PYTHON_GUNICORN_VERSION = 20.1.0
+PYTHON_GUNICORN_VERSION = 21.2.0
 PYTHON_GUNICORN_SOURCE = gunicorn-$(PYTHON_GUNICORN_VERSION).tar.gz
-PYTHON_GUNICORN_SITE = https://files.pythonhosted.org/packages/28/5b/0d1f0296485a6af03366604142ea8f19f0833894db3512a40ed07b2a56dd
+PYTHON_GUNICORN_SITE = https://files.pythonhosted.org/packages/06/89/acd9879fa6a5309b4bf16a5a8855f1e58f26d38e0c18ede9b3a70996b021
 PYTHON_GUNICORN_SETUP_TYPE = setuptools
 PYTHON_GUNICORN_LICENSE = MIT
 PYTHON_GUNICORN_LICENSE_FILES = LICENSE