Update alpine Docker tag to v3.20.2 (#5771)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| alpine | final | patch | `3.20.1` -> `3.20.2` |
| alpine | stage | patch | `3.20.1` -> `3.20.2` |

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Signed-off-by: Mend Renovate <[email protected]>

docker/base/Dockerfile

@@ -1,6 +1,6 @@
-FROM alpine:3.20.1 AS cert
+FROM alpine:3.20.2 AS cert
 RUN apk add --update --no-cache ca-certificates mailcap
 
-FROM alpine:3.20.1
+FROM alpine:3.20.2
 COPY --from=cert /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=cert /etc/mime.types /etc/mime.types