ci: bump dojo-integration-test dojo ref

[kariy]

Updates the pinned dojoengine/dojo revision used by dojo-integration-test from v1.7.0-alpha.2 to a6c6047d5e038b83041e06ecfb704ab390981140 so the integration test runs against the current tip of dojo's main branch, which includes dojoengine/dojo#3402. Also bumps scarb from dev-2025-09-05 to 2.13.1 to match the cairo/starknet 2.13 pins in examples/spawn-and-move/Scarb.toml, switches the project build step from sozo build to scarb build, clones Dojo into /tmp/dojo instead of inside $GITHUB_WORKSPACE so proc-macro resolution during scarb build doesn't collide with Katana's root Cargo.toml workspace, builds sozo from the cloned Dojo source so migrate runs with the sozo matching the revision under test instead of a stale asdf-installed release, and starts Katana with --dev --dev.no-fee so sozo migrate transactions aren't rejected by the mempool. The no-fee flag is needed because Katana's genesis block header is initialized with GasPrices::MIN (1 wei) while the live gas oracle used by mempool validation returns 20 gwei, and sozo (via starknet-rs) estimates fees against BlockTag::Latest which points to genesis right after startup, so the estimated max L1 gas price ends up at 1 wei and gets rejected against the oracle's 20 gwei floor.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.82%. Comparing base (9bde0ae) to head (85468db).
⚠️ Report is 375 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
- Coverage   73.32%   66.82%   -6.51%     
==========================================
  Files         209      309     +100     
  Lines       23132    42985   +19853     
==========================================
+ Hits        16961    28723   +11762     
- Misses       6171    14262    +8091     

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