chore(workspace): set multiple-versions to deny

[Farukest]

Description:

Summary

• Sets multiple-versions = "deny" in deny.toml as follow-up to chore: cargo deny root reth repo #408
• Adds skip list for upstream dependencies (reth, alloy, kona) that have unavoidable version conflicts

Changes

• Changed multiple-versions from "allow" to "deny"
• Added 64 crates to skip list (windows-*, syn, rand, hashbrown, etc.) that come from upstream dependencies we cannot control

Verification

• cargo deny check bans passes with bans ok

Closes #409

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 2/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1