Bump centos7/python-38-centos7 from 0a7c7e6 to 52f4026 in /ci

Bumps centos7/python-38-centos7 from `0a7c7e6` to `52f4026`.

---
updated-dependencies:
- dependency-name: centos7/python-38-centos7
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

ci/Dockerfile

@@ -1,4 +1,4 @@
-FROM quay.io/centos7/python-38-centos7:centos7@sha256:0a7c7e69f1ab42d1acb44c27904863c53d84c34fe6b9197c82231f0e4bb448a4
+FROM quay.io/centos7/python-38-centos7:centos7@sha256:52f4026971a24bf446d983eb1d43951d5f01ea7b4b4b77b4c3338fb0d0c191be
 
 ARG USER=wam-builder
 ARG USER_UID