Bump oss/go/microsoft/golang from ac43b1e to b2768e5

Bumps oss/go/microsoft/golang from `ac43b1e` to `b2768e5`.

---
updated-dependencies:
- dependency-name: oss/go/microsoft/golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=${BUILDPLATFORM} mcr.microsoft.com/oss/go/microsoft/golang:1.21@sha256:ac43b1ed13ad1315cffa2690fc037aebc947837d296f5245a2770e68414d282c AS go
+FROM --platform=${BUILDPLATFORM} mcr.microsoft.com/oss/go/microsoft/golang:1.21@sha256:b2768e50dda922c3a355b968f335cd1cb8147d80eacc53d9717253424a750b28 AS go
 
 FROM go  AS frontend-build
 WORKDIR /build