fix: update Alpine version from 3.21 to 3.20 for Go 1.23 compatibility

Author: Mat001

scripts/dockerfiles/Dockerfile.alpine

@@ -1,13 +1,13 @@
 ARG GO_VERSION
-FROM golang:$GO_VERSION-alpine3.21 as builder
+FROM golang:$GO_VERSION-alpine3.20 as builder
 # hadolint ignore=DL3018
 RUN addgroup -S agentgroup && adduser -S agentuser -G agentgroup
 RUN apk add --no-cache make gcc libc-dev git curl
 WORKDIR /go/src/github.com/optimizely/agent
 COPY . .
 RUN make setup build
 
-FROM alpine:3.21
+FROM alpine:3.20
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /go/src/github.com/optimizely/agent/bin/optimizely /optimizely
 COPY --from=builder /etc/passwd /etc/passwd