sdk/opa_test: increase max delta (0.5s) (#4513)
sdk/opa_test: increase max delta (0.5s) (#4513)

When running on GHA, we've found this test to often fail on macos-latest:
It would not functionally be wrong, but it also wasn't able to finish in
the alloted time. Now, the maximum delta has been increased a lot (10ms to
500ms). It's much, but it's still good enough to ensure that the context
passed to Stop() is the one that matters for shutdown.

Signed-off-by: Stephan Renatus <0d0a21c7604d0d452d5c1019ca18e48a97a9a057@gmail.com>
tsandall/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa