Bump alpine from 3.21.0 to 3.21.2 in /clotributor-tracker

Bumps alpine from 3.21.0 to 3.21.2.

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

clotributor-tracker/Dockerfile

@@ -10,7 +10,7 @@ WORKDIR /clotributor/clotributor-tracker
 RUN cargo build --release
 
 # Final stage
-FROM alpine:3.21.0
+FROM alpine:3.21.2
 RUN apk --no-cache add ca-certificates && addgroup -S clotributor && adduser -S clotributor -G clotributor
 USER clotributor
 WORKDIR /home/clotributor