CI: pin grpcio<1.82 in e2e to fix flower-superlink startup#10
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grpcio 1.82.0 (2026-07-06) breaks `flower-superlink` startup; the e2e installs it unpinned via flwr, so the nightly has been red since then. Pin to the last known-good grpcio to keep the e2e validating against a working stack. Temporary workaround tracked in #9.
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Hotfix so the real-app e2e (and its README badge) goes green on
main.grpcio-health-checking 1.82.0 (2026-07-06) ships protobuf 7.x gencode incompatible with the protobuf 6.x runtime flwr pins, crashing
flower-superlinkat import. Pingrpcio<1.82+grpcio-health-checking<1.82in the e2e — the same cap Flower merged upstream in flwrlabs/flower#7541.Temporary; remove once a fixed flwr releases. Tracked in #9.