chore(submodules): bump theta-agent to v2.1.3 (fixes v2.1.2 CI failure)
v2.1.2's release build failed on the Windows CI leg (test-only issue -- TestApplyHostsOverride_* didn't skip on non-Linux, where applyHostsOverride() correctly refuses). v2.1.2's actual code was never functionally broken, but v2.1.3 is the release whose CI run is actually green, so that's what theta-suite should point at.
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