chore(deps): bump golang in /.docker

Bumps golang from 1.22.5-bullseye to 1.23rc2-bullseye.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.docker/Dockerfile-build

@@ -1,5 +1,5 @@
 # Workaround for https://github.com/GoogleContainerTools/distroless/issues/1342
-FROM golang:1.22.5-bullseye AS builder
+FROM golang:1.23rc2-bullseye AS builder
 
 WORKDIR /go/src/github.com/ory/keto