Update pypy

Changes:

- https://github.com/docker-library/pypy/commit/409e50c: Update to 7.3.2, pip 20.2.3

library/pypy

@@ -15,13 +15,13 @@ GitCommit: af46309f0e0d85beef6b1ad2d4f05f5af7550033
 Directory: 2.7/slim
 
 Tags: 3.6-7.3.2, 3.6-7.3, 3.6-7, 3.6, 3-7.3.2, 3-7.3, 3-7, 3, latest, 3.6-7.3.2-buster, 3.6-7.3-buster, 3.6-7-buster, 3.6-buster, 3-7.3.2-buster, 3-7.3-buster, 3-7-buster, 3-buster, buster
-Architectures: amd64, i386, s390x
-GitCommit: af46309f0e0d85beef6b1ad2d4f05f5af7550033
+Architectures: amd64, arm64v8, i386, s390x
+GitCommit: 409e50c2f4e32b17e18d5da560d5f5a34b6aca4a
 Directory: 3.6
 
 Tags: 3.6-7.3.2-slim, 3.6-7.3-slim, 3.6-7-slim, 3.6-slim, 3-7.3.2-slim, 3-7.3-slim, 3-7-slim, 3-slim, slim, 3.6-7.3.2-slim-buster, 3.6-7.3-slim-buster, 3.6-7-slim-buster, 3.6-slim-buster, 3-7.3.2-slim-buster, 3-7.3-slim-buster, 3-7-slim-buster, 3-slim-buster, slim-buster
-Architectures: amd64, i386, s390x
-GitCommit: af46309f0e0d85beef6b1ad2d4f05f5af7550033
+Architectures: amd64, arm64v8, i386, s390x
+GitCommit: 409e50c2f4e32b17e18d5da560d5f5a34b6aca4a
 Directory: 3.6/slim
 
 Tags: 3.7-7.3.2, 3.7-7.3, 3.7-7, 3.7, 3.7-7.3.2-buster, 3.7-7.3-buster, 3.7-7-buster, 3.7-buster