snaps chore: Bump @metamask/eth-json-rpc-middleware from 17.0.1 to 21.0.0

Bumps @metamask/eth-json-rpc-middleware from 17.0.1 to 21.0.0.

Commits

1cb03b9 Release 625.0.0 (#6883)
04ef362 docs: Update README to include eth-json-rpc-middleware in dependency graph ...
8cc50b7 chore: Fix invalid PR number in eth-block-tracker changelog (#6881)
64f0777 chore: Migrate @metamask/eth-json-rpc-middleware to /packages (#6866)
7e3f1a6 docs: Update README to include eth-block-tracker in dependency graph (#6878)
b8756fc chore: Migrate eth-block-tracker to main packages folder (#6865)
0ee9123 chore: Update eth-block-tracker README (#6858)
83da949 chore: Update eth-json-rpc-middleware README (#6859)
3cd7a4c chore: Align eth-json-rpc-middleware dependencies with monorepo (#6857)
2479a18 chore: Align eth-block-tracker dependencies with monorepo (#6856)
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[!NOTE] Upgrade snaps-simulation to use @metamask/eth-json-rpc-middleware v21 with corresponding lockfile and related dependency updates.

Dependencies:

Bump @metamask/eth-json-rpc-middleware to ^21.0.0 in packages/snaps-simulation/package.json.

Update lockfile to align transitive deps:

@metamask/eth-block-tracker → ^14.0.0

@metamask/eth-json-rpc-provider → ^5.0.1

@metamask/eth-sig-util → ^8.2.0

Normalize ranges for @metamask/json-rpc-engine and @metamask/utils.

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