EEBus: fix GridGuard entity type removed from LPC/LPP

[andig]

fixes #31561

Bumps the enbility/eebus-go replace to a new evcc-io/eebus-go branch (rollup-gridguard) that adds enbility/eebus-go#235 on top of the current pin. That upstream PR restores EntityTypeTypeGridGuard to the CsLPC/CsLPP valid entity types, which enbility/eebus-go#224 (pulled in via #31550) had accidentally dropped. Without it, a ControlBox's GridGuard entity was silently discarded, CsLPC never bound to it, HEMS never received a heartbeat, and the LPC failsafe tripped deterministically about two minutes after boot.

• go.mod/go.sum: enbility/eebus-go replace now points at evcc-io/eebus-go@rollup-gridguard

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[andig]

Added TestControlBoxGridGuardHeartbeat (server/eebus/test/gridguard_test.go): a ControlBox test double exposing only a GridGuard entity connects, and the test asserts CsLPCInterface.IsHeartbeatWithinDuration() becomes true. Verified it fails deterministically against the pre-fix eebus-go commit (heartbeatDiag never gets set because deviceConnected filters the ControlBox's DeviceDiagnosis entity out via validEntityTypes) and passes against the fix.

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