Update git hash for flame-engine/flame

[spydon]

Updates the pinned commit for registry/flame.test from 74721f09 to c35f9d80, the current head of flame-engine/flame main.

This picks up two changes that make the Flame customer test deterministic:

• test: Loosen the residual tolerance in the solveQuadratic random test flame-engine/flame#4051 fixes the solveQuadratic solve random equation test. Its residual tolerance only scaled with the leading coefficient, so seeds that produced a root with a large magnitude failed even though the solver result was within two ulps of the largest term. That is what caused the recent customer test failure:

  solveQuadratic solve random equation [seed=2248645231] [E]
    Expected: a numeric value within <2.8058337378801097e-15> of <0>
      Actual: <3.1086244689504383e-15>
  

• feat: Lock random seeds in the flutter/tests customer testing run flame-engine/flame#4052 pins all of Flame's randomized tests to a fixed seed when they are run through scripts/customer_testing.dart, so this run can no longer fail on a seed that has nothing to do with the framework change under test. Flame's own CI keeps running them with fresh seeds.

[jtmcdole]

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The LGTM exchange rates are currently trading at:

• 1 LGTM = Golden images match closely enough if I squint.
• 2 LGTMs = I checked that this won't break the devicelab benchmarks.
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• 4 LGTMs = CI is green on the first try without a single retry or shard failure.

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