deps(deps): bump devcontainers/go from 1.26-bookworm to 2-1.26-bookworm in /.devcontainer (#776)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.devcontainer/Dockerfile

@@ -3,7 +3,7 @@
 # GOTOOLCHAIN=auto lets Go download the exact patch version (e.g. 1.25.9)
 # when the base image is slightly behind. Downloads are verified against
 # sum.golang.org.
-FROM mcr.microsoft.com/devcontainers/go:1.26-bookworm
+FROM mcr.microsoft.com/devcontainers/go:2-1.26-bookworm
 ENV GOTOOLCHAIN=auto
 
 # The base image sets GOPATH=/go owned by root. Override to a user-writable