Part of #1230
When reusing an already-running Ryuk reaper, testcontainers-go v0.43.0
waits only for its Docker port mapping. Docker exposes that port before
Ryuk is listening, so a second package can connect too early and lose
the handshake with `read ack: EOF`. That is
[testcontainers-go#3743](https://github.com/testcontainers/testcontainers-go/issues/3743);
v0.44.0 also waits for the reaper's `Started` log line
([#3761](https://github.com/testcontainers/testcontainers-go/pull/3761)).
A package whose handshake fails is not counted as a Ryuk client but its
containers still carry the shared session label, so another package
exiting can delete a database that is still in use — the failure
reported in #1230.
## Scope
This helps local runs, where the reaper stays on. **It does not fix CI
on its own**, so it is deliberately separate from #1235, which disables
the reaper for `run-tests`.
Measured on a 4-core Linux VM with cold build caches, which staggers
package start times the way CI does:
```
v0.43.0, 3 rounds handshake failures in 3/3 rounds; one round cascaded
v0.44.0, 3 rounds no handshake failures; database tests still unavailable in 3/3 rounds
```
Under v0.44.0 the failures move to `wait for reaper <id>: context
deadline exceeded` — a late package finds a reaper that is already
shutting down, and one readiness probe (`defaultStartupTimeout`, 60s)
outlives the whole reaper retry budget (`MaxElapsedTime`, 20s), so the
retry loop never gets a second attempt. The remaining fail-open behind
all of this is
[#3827](https://github.com/testcontainers/testcontainers-go/issues/3827),
still open upstream.
## Diff size
Four lines of `go.mod`. The rest is `go mod vendor` output: v0.44.0
pulls newer `moby/client`, `gopsutil`, and `otelhttp`, and `otelhttp`
moves `otel/semconv` from v1.39.0 to v1.41.0. Insertions and deletions
nearly cancel because most of it is a directory swap and one generated
`httpsnoop` file being merged into another.
```
go.mod, go.sum 62 lines
vendor/ 61 files, 17356 +/17490 -
```
`hack/verify/go-modules.sh`, `licenses.sh`, `boilerplate.sh`, and
`gofmt.sh` all pass; `go test -race ./cmd/ateapi/...` is green with no
silently skipped database tests.
---
- [x] Tests pass
- [x] Appropriate changes to documentation are included in the PR
NekoPunch