docs: update testnet network page for the v5 rollup upgrade

[aminsammara]

Summary

Updates the Testnet column of the network page to the newly deployed v5 rollup and its associated L1 contracts, bumps the Rollup Version, and sets the software Version to 5.0.0.

Changes (Testnet)

• Version: 5.0.0-rc.2 → 5.0.0
• Rollup Version: 2787991301 → 1821665230
• Rollup: 0xfe606180… → 0xd73a91bd…
• Also updated to the new deployment: L1 → L2 Inbox, L2 → L1 Outbox, Fee Juice Portal, Honk Verifier, Reward Booster, Slasher, Tally Slashing Proposer, Slash Payload Cloneable
• Unchanged (reused across the upgrade): Registry, Governance, Governance Proposer, Governance Staking Escrow, Fee Juice, Staking Asset, Coin Issuer, Reward Distributor, Fee Asset Handler, Staking Registry, Slash Factory

Notes

• Every new address was read directly from the deployed rollup's getters on Sepolia.
• The new rollup becomes canonical only when the pending governance proposal executes (executable window ~2026-07-13 12:51 to 2026-07-14 12:51 UTC), so this should merge around then.
• Mainnet column is unchanged.