build(deps): bump oss/go/microsoft/golang in /backend

Bumps oss/go/microsoft/golang from `6c1b07d` to `e6951a3`.

---
updated-dependencies:
- dependency-name: oss/go/microsoft/golang
  dependency-type: direct:production
...

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

backend/Dockerfile

@@ -1,5 +1,5 @@
 # Builder image installs tools needed to build aro-hcp-backend
-FROM --platform=linux/amd64 mcr.microsoft.com/oss/go/microsoft/golang:1.23-fips-cbl-mariner2.0@sha256:6c1b07df15c152fb6a7f4eeece5f50824d83b8bf672709cc951aaa0d5c29887f as builder
+FROM --platform=linux/amd64 mcr.microsoft.com/oss/go/microsoft/golang:1.23-fips-cbl-mariner2.0@sha256:e6951a34cc0cbdc62b5110c4301dfe9c8daf8ee89c1b8616082a6e0b89cd820f as builder
 WORKDIR /app
 ADD archive.tar.gz .
 # https://github.com/microsoft/go/tree/microsoft/main/eng/doc/fips#build-option-to-require-fips-mode