Bump protocol 26 core version to 27.0.0-3288.7696c069d

[sisuresh]

Similar to #528 — bumps the core version used by the CI integration tests so we can run them against 27.0.0-3288.7696c069d.

Only the P26 lane is bumped; P25 pins are unchanged. (Companion to stellar/stellar-horizon#188.)

Draft — for running CI integration tests only.

[Shaptic]

I'll gladly approve but this is only half of the battle: at this point we'd want to bump the protocol_versions to '26' and '27' in the integration-* jobs. Also I think this should target the protocol-next branch!

[sisuresh]

I'll gladly approve but this is only half of the battle: at this point we'd want to bump the protocol_versions to '26' and '27' in the integration-* jobs. Also I think this should target the protocol-next branch!

This isn't meant to be merged. We just want to run the package against the integration tests.

[sisuresh]

We need to rethink this flow for protocol releases though. And also automate whatever we come up with.

[Shaptic]

Yeah 100%, all of the draft PRs are like 95% of the way to being mergeable and it'd save a lot of churn.