fix: Dockerfile to reduce vulnerabilities (linode#239)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6913413
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6928845
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6928846
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6928846
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6928847

Co-authored-by: snyk-bot <[email protected]>

Author: unn

Dockerfile

@@ -11,7 +11,7 @@ COPY sentry ./sentry
 RUN go mod download
 RUN go build -a -ldflags '-extldflags "-static"' -o /bin/linode-cloud-controller-manager-linux /linode
 
-FROM alpine:3.19.1
+FROM alpine:3.20.3
 RUN apk add --update --no-cache ca-certificates
 LABEL maintainers="Linode"
 LABEL description="Linode Cloud Controller Manager"