Bump frolvlad/alpine-python3 in /benchmarks/docker (#1130)

Bumps frolvlad/alpine-python3 from `c5c0232` to `c934884`.

---
updated-dependencies:
- dependency-name: frolvlad/alpine-python3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

benchmarks/docker/Dockerfile-benchmark

@@ -1,4 +1,4 @@
-FROM frolvlad/alpine-python3@sha256:c5c0232e680793ea76fe91cdd01357565099bea09e3fe1307b3b991dbc99b33f
+FROM frolvlad/alpine-python3@sha256:c93488425183b40d2b2bbf994488445d0cbeb65c95c0ecb7ee5b7f0cb0c430d6
 
 RUN apk add docker openrc
 RUN rc-update add docker boot