chore: bump OPENCLAW_GIT_REF to latest release

Author: aserven

Dockerfile

@@ -22,7 +22,7 @@ WORKDIR /openclaw
 
 # Pin to a known-good ref (tag/branch). Override in Railway template settings if needed.
 # Using a released tag avoids build breakage when `main` temporarily references unpublished packages.
-ARG OPENCLAW_GIT_REF=v2026.2.22
+ARG OPENCLAW_GIT_REF=v2026.3.1
 RUN git clone --depth 1 --branch "${OPENCLAW_GIT_REF}" https://github.com/openclaw/openclaw.git .
 
 # Patch: relax version requirements for packages that may reference unpublished versions.