Update python

Changes:

- https://github.com/docker-library/python/commit/aea115f: Update to 3.9.0a3, pip 20.0.2

library/python

@@ -4,28 +4,28 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/python.git
 
-Tags: 3.9.0a2-buster, 3.9-rc-buster, rc-buster
-SharedTags: 3.9.0a2, 3.9-rc, rc
+Tags: 3.9.0a3-buster, 3.9-rc-buster, rc-buster
+SharedTags: 3.9.0a3, 3.9-rc, rc
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 3b0aaaabe27172a3adae5b3ae76c2b258f501f20
+GitCommit: aea115fc595cd19cbcb2d2ad31ead8601d3b29c5
 Directory: 3.9-rc/buster
 
-Tags: 3.9.0a2-alpine3.10, 3.9-rc-alpine3.10, rc-alpine3.10
+Tags: 3.9.0a3-alpine3.10, 3.9-rc-alpine3.10, rc-alpine3.10
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 3b0aaaabe27172a3adae5b3ae76c2b258f501f20
+GitCommit: aea115fc595cd19cbcb2d2ad31ead8601d3b29c5
 Directory: 3.9-rc/alpine3.10
 
-Tags: 3.9.0a2-windowsservercore-ltsc2016, 3.9-rc-windowsservercore-ltsc2016, rc-windowsservercore-ltsc2016
-SharedTags: 3.9.0a2-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0a2, 3.9-rc, rc
+Tags: 3.9.0a3-windowsservercore-ltsc2016, 3.9-rc-windowsservercore-ltsc2016, rc-windowsservercore-ltsc2016
+SharedTags: 3.9.0a3-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0a3, 3.9-rc, rc
 Architectures: windows-amd64
-GitCommit: 3b0aaaabe27172a3adae5b3ae76c2b258f501f20
+GitCommit: aea115fc595cd19cbcb2d2ad31ead8601d3b29c5
 Directory: 3.9-rc/windows/windowsservercore-ltsc2016
 Constraints: windowsservercore-ltsc2016
 
-Tags: 3.9.0a2-windowsservercore-1809, 3.9-rc-windowsservercore-1809, rc-windowsservercore-1809
-SharedTags: 3.9.0a2-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0a2, 3.9-rc, rc
+Tags: 3.9.0a3-windowsservercore-1809, 3.9-rc-windowsservercore-1809, rc-windowsservercore-1809
+SharedTags: 3.9.0a3-windowsservercore, 3.9-rc-windowsservercore, rc-windowsservercore, 3.9.0a3, 3.9-rc, rc
 Architectures: windows-amd64
-GitCommit: 3b0aaaabe27172a3adae5b3ae76c2b258f501f20
+GitCommit: aea115fc595cd19cbcb2d2ad31ead8601d3b29c5
 Directory: 3.9-rc/windows/windowsservercore-1809
 Constraints: windowsservercore-1809