stack/slapos: version up urllib3 1.26.9 and requests 2.27.1

fixes CVE-2021-33503

stack/slapos.cfg

@@ -183,7 +183,8 @@ pyOpenSSL = 19.1.0
 pyparsing = 2.2.0
 pytz = 2016.10
 regex = 2020.9.27
-requests = 2.24.0
+requests = 2.27.1
+charset-normalizer = 2.0.12
 scandir = 1.10.0
 setproctitle = 1.1.10
 setuptools-dso = 1.7
@@ -247,7 +248,7 @@ uritemplate = 3.0.0
 zope.interface = 4.3.3
 certifi = 2020.6.20
 chardet = 3.0.4
-urllib3 = 1.25.9
+urllib3 = 1.26.9
 pkgconfig = 1.5.1
 distro = 1.7.0