Bump alpine from 3.15.1 to 3.15.3 (#20)

Bumps alpine from 3.15.1 to 3.15.3.

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

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

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

Author: dependabot[bot]

Dockerfile

@@ -9,7 +9,7 @@ COPY . .
 
 RUN go mod download && make release
 
-FROM alpine:3.15.1
+FROM alpine:3.15.3
 LABEL maintainer="SkynetLabs <[email protected]>"
 
 COPY --from=builder /go/bin/malware-scanner /usr/bin/malware-scanner