Pin the correct version of replicache-client in bindings build

[aboodman]

Otherwise breaking changes in replicache-client have to be synchronously fixed in bindings which isn't practical.

Related to https://github.com/rocicorp/replicache/issues/60

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[aboodman]

@arv I made this for the bindings, but it's not working. It makes a lot of changes to sync_replay.json (is that expected?) but more importantly a test fails here:

00:08 +0 -1: sync [E]                                                                                                                                        
  Expected: <6>
    Actual: <9>

  package:test_api                                   expect
  package:flutter_test/src/widget_tester.dart 234:3  expect
  replicache_test.dart 577:7                         main.<fn>

halp?

[aboodman]

On the upside your unit test totally caught a compatibility break in repm so whee!

[arv]

  Expected: <6>
    Actual: <9>

Looks like it is replaying too much.

The json file changes a lot due to the hashes changing due to the commit contains a date. We might want to consider either having the test server return fake dates or having the test data redact the hashes. It also changes slightly due to the async nature but I think we could "fix" that by introducing some short Future.delayer in a few select places.