chore(deps): bump alpine in /aries/agents/aath-backchannel

Bumps alpine from 3.20.1 to 3.20.3.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

aries/agents/aath-backchannel/Dockerfile.aries-vcx

@@ -1,4 +1,4 @@
-FROM alpine:3.20.1 AS builder
+FROM alpine:3.20.3 AS builder
 
 ARG UID=1000
 ARG GID=1000
@@ -26,7 +26,7 @@ COPY --chown=aries:aries . vcx
 WORKDIR /home/aries/vcx
 RUN cargo build --bin aries-vcx-backchannel
 
-FROM alpine:3.20.1
+FROM alpine:3.20.3
 
 ARG UID=1000
 ARG GID=1000