Bump golang from c4b696f to d8c365d in /internal/witness/cmd/feeder

Bumps golang from `c4b696f` to `d8c365d`.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

internal/witness/cmd/feeder/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21.6-bookworm@sha256:c4b696f1b2bf7d42e02b62b160c3f81c39386e1c567603df8c514ad6ce93361d as builder
+FROM golang:1.21.6-bookworm@sha256:d8c365d63879c2312e332cb796961f2695dd65124ceb3c0247d9c5426b7dde5f as builder
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS