merge #5150 into opencontainers/runc:main

Aleksa Sarai (1):
  conformance: poststart hooks spec now matches runc

LGTMs: rata kolyshkin

Author: cyphar

docs/spec-conformance.md

@@ -8,7 +8,6 @@ The following features are not implemented yet:
 Spec version | Feature                                        | PR
 -------------|------------------------------------------------|----------------------------------------------------------
 v1.1.0       | `SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV`       | [#3862](https://github.com/opencontainers/runc/pull/3862)
-v1.3.0       | Fail on a failure of a poststart hook.         | [#4348](https://github.com/opencontainers/runc/pull/4348)
 
 ## Architectures