Update Rust crate scc to v3

[hash-worker]

This PR contains the following updates:

Package	Type	Update	Change
scc	workspace.dependencies	major	2.4.0 -> 3.0.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.03%. Comparing base (ef314c5) to head (edc8cd4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8131   +/-   ##
=======================================
  Coverage   63.03%   63.03%           
=======================================
  Files        1302     1302           
  Lines      132960   132960           
  Branches     5509     5509           
=======================================
  Hits        83808    83808           
  Misses      48238    48238           
  Partials      914      914           

Flag	Coverage Δ
apps.hash-ai-worker-ts	1.40% <ø> (ø)
apps.hash-api	0.00% <ø> (ø)
blockprotocol.type-system	40.84% <ø> (ø)
local.claude-hooks	0.00% <ø> (ø)
local.harpc-client	51.24% <ø> (ø)
local.hash-graph-sdk	7.73% <ø> (ø)
local.hash-isomorphic-utils	0.00% <ø> (ø)
rust.antsi	0.00% <ø> (ø)
rust.error-stack	90.88% <ø> (ø)
rust.harpc-codec	84.70% <ø> (ø)
rust.harpc-types	0.00% <ø> (ø)
rust.harpc-wire-protocol	92.23% <ø> (ø)
rust.hash-codec	72.76% <ø> (ø)
rust.hash-graph-authorization	62.34% <ø> (ø)
rust.hash-graph-postgres-store	27.48% <ø> (ø)
rust.hash-graph-store	37.86% <ø> (ø)
rust.hash-graph-temporal-versioning	47.95% <ø> (ø)
rust.hash-graph-types	0.00% <ø> (ø)
rust.hash-graph-validation	83.45% <ø> (ø)
rust.hashql-ast	87.25% <ø> (ø)
rust.hashql-compiletest	29.69% <ø> (ø)
rust.hashql-core	82.26% <ø> (ø)
rust.hashql-diagnostics	72.43% <ø> (ø)
rust.hashql-eval	69.13% <ø> (ø)
rust.hashql-hir	89.11% <ø> (ø)
rust.hashql-mir	92.43% <ø> (ø)
rust.hashql-syntax-jexpr	94.05% <ø> (ø)

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[cursor]

PR Summary

Medium Risk
Major-version dependency bump for scc can introduce subtle behavioral/performance changes in concurrent containers even without direct code changes; risk is limited to dependency resolution and downstream compilation/runtime behavior.

Overview
Updates the workspace dependency on scc from 2.4.0 to 3.0.0.

Refreshes Cargo.lock accordingly, pulling in newer scc (3.6.6) and updated transitive deps (notably sdd 4.x plus new saa), with no other code changes in this PR.

^{Written by Cursor Bugbot for commit edc8cd4. This will update automatically on new commits. Configure here.}