cmd/worker: bump Go version in Dockerfile

Change-Id: I4a455713d6a0201c8d76e537ca939d3b389b25d5
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/612216
Auto-Submit: Tatiana Bradley <tatianabradley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>

cmd/worker/Dockerfile

@@ -5,7 +5,7 @@
 # This Dockerfile expects the build context to be the repo root.
 
 ################################################################
-FROM golang:1.21 AS builder
+FROM golang:1.23 AS builder
 # If you change the Go version above, change the FROM line below as well.
 
 # Set the working directory outside $GOPATH to ensure module mode is enabled.
@@ -28,7 +28,7 @@ COPY . /src
 RUN go build -mod=readonly ./cmd/worker
 
 ################################################################
-FROM golang:1.21
+FROM golang:1.23
 
 LABEL maintainer="Go VulnDB Team <go-vulndb-team@google.com>"