Foundry v1.8.6: chore: release 1.8.6 (#17718)

Release notes

Cherry-picks onto v1.8.5 for the v1.8.6 patch release:

• #17411 chore: bump version to 1.8.6

• #17499 chore(ci): re-pin dtolnay/rust-toolchain v1

• #17553 chore(deps): bump the ci-weekly group with 5 updates

• #17572 fix(deps): update rustls for security advisories

• #17612 fix(ci): stop rust-toolchain tag drift failures

• #17621 chore(deps): bump the ci-weekly group across 1 directory with 6 updates

• #17630 chore(deps): bump svm to 0.5.30

• #17661 chore(deps): bump Soldeer to 0.12.1

• #17687 fix(ci): install Vyper without source builds

• #17705 chore: update deps

• #17422 test(cast): update Amsterdam trace snapshot

Also drops the stale soldeer git allowlist entry from deny.toml.