Update python

Changes:

- https://github.com/docker-library/python/commit/6a8869e: Update to 3.9.0rc1, pip 20.2.2

library/python

@@ -4,33 +4,33 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/python.git
 
-Tags: 3.9.0b5-buster, 3.9-rc-buster, rc-buster
-SharedTags: 3.9.0b5, 3.9-rc, rc
+Tags: 3.9.0rc1-buster, 3.9-rc-buster, rc-buster
+SharedTags: 3.9.0rc1, 3.9-rc, rc
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 4f3f45defcaf66b86474f1372cbd25b4bc24bb66
+GitCommit: 6a8869e8a4e90d6ae4ca3569d1f7dbb867c9ad74
 Directory: 3.9-rc/buster
 
-Tags: 3.9.0b5-slim-buster, 3.9-rc-slim-buster, rc-slim-buster, 3.9.0b5-slim, 3.9-rc-slim, rc-slim
+Tags: 3.9.0rc1-slim-buster, 3.9-rc-slim-buster, rc-slim-buster, 3.9.0rc1-slim, 3.9-rc-slim, rc-slim
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 4f3f45defcaf66b86474f1372cbd25b4bc24bb66
+GitCommit: 6a8869e8a4e90d6ae4ca3569d1f7dbb867c9ad74
 Directory: 3.9-rc/buster/slim
 
-Tags: 3.9.0b5-alpine3.12, 3.9-rc-alpine3.12, rc-alpine3.12, 3.9.0b5-alpine, 3.9-rc-alpine, rc-alpine
+Tags: 3.9.0rc1-alpine3.12, 3.9-rc-alpine3.12, rc-alpine3.12, 3.9.0rc1-alpine, 3.9-rc-alpine, rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 4f3f45defcaf66b86474f1372cbd25b4bc24bb66
+GitCommit: 6a8869e8a4e90d6ae4ca3569d1f7dbb867c9ad74
 Directory: 3.9-rc/alpine3.12
 
-Tags: 3.9.0b5-windowsservercore-ltsc2016, 3.9-rc-windowsservercore-ltsc2016, rc-windowsservercore-ltsc2016
-SharedTags: 3.9.0b5-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0b5, 3.9-rc, rc
+Tags: 3.9.0rc1-windowsservercore-ltsc2016, 3.9-rc-windowsservercore-ltsc2016, rc-windowsservercore-ltsc2016
+SharedTags: 3.9.0rc1-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0rc1, 3.9-rc, rc
 Architectures: windows-amd64
-GitCommit: 4f3f45defcaf66b86474f1372cbd25b4bc24bb66
+GitCommit: 6a8869e8a4e90d6ae4ca3569d1f7dbb867c9ad74
 Directory: 3.9-rc/windows/windowsservercore-ltsc2016
 Constraints: windowsservercore-ltsc2016
 
-Tags: 3.9.0b5-windowsservercore-1809, 3.9-rc-windowsservercore-1809, rc-windowsservercore-1809
-SharedTags: 3.9.0b5-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0b5, 3.9-rc, rc
+Tags: 3.9.0rc1-windowsservercore-1809, 3.9-rc-windowsservercore-1809, rc-windowsservercore-1809
+SharedTags: 3.9.0rc1-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0rc1, 3.9-rc, rc
 Architectures: windows-amd64
-GitCommit: 4f3f45defcaf66b86474f1372cbd25b4bc24bb66
+GitCommit: 6a8869e8a4e90d6ae4ca3569d1f7dbb867c9ad74
 Directory: 3.9-rc/windows/windowsservercore-1809
 Constraints: windowsservercore-1809