`nats.go v1.54.0` declares `go >= 1.26`, so `go mod tidy` puts the directive at
1.26.0 and will not leave it at 1.25. The base image is pinned by digest at
1.25.14-alpine, so nothing in this repository compiles against it — caught when the
build machine's own build failed with "go.mod requires go >= 1.26.0 (running go
1.25.14)".
Moved to 1.26.8-alpine by digest, same flavour as before. The pin stays a digest:
the point of pinning is that the compiler does not change underneath a build, and
that is still true one version along.
Two other manifests carry the same pin for the same reason — they compile this
repository's code — and move with it in the catalogue.