fix: Dockerfile.sumologic-mock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE320-MUSL-8720638
- https://snyk.io/vuln/SNYK-ALPINE320-MUSL-8720638
- https://snyk.io/vuln/SNYK-ALPINE320-OPENSSL-7413532
- https://snyk.io/vuln/SNYK-ALPINE320-OPENSSL-8690013
- https://snyk.io/vuln/SNYK-ALPINE320-OPENSSL-8710359

Author: snyk-bot

Dockerfile.sumologic-mock

@@ -11,7 +11,7 @@ WORKDIR /sumologic-mock
 COPY ./src/rust/sumologic-mock .
 RUN cargo build --release
 
-FROM alpine:3.20.1
+FROM alpine:3.21.3
 ARG TARGETARCH
 ARG TARGETOS