Update op-geth/op-node for U15

[bradleycamacho]

• Updated the release versions for op-node and op-geth to v1.13.2 and v1.101503.4, respectively, to reflect the Mainnet Superchain activation.
• Revised text to clarify that the releases are for the Isthmus Mainnet Superchain activation, replacing references to Sepolia.

Removal of Outdated Callouts:

• Removed an informational callout about the availability of Mainnet node binaries, as it is no longer relevant.
• Removed an informational callout regarding the override flag for op-node, which was missed earlier but is addressed in the Mainnet release.

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📝 Walkthrough

Walkthrough

This update modifies the upgrade notice for the Isthmus Mainnet and Sepolia Superchain activation. It removes an informational callout that previously stated the Mainnet node binaries would be available soon and that the listed versions applied only to the Sepolia Superchain activation. The description of the releases is changed to indicate that they include both the Isthmus Mainnet and Sepolia Superchain activation timestamps. The versions of op-node and op-geth are updated from v1.13.0 and v1.101503.2 to v1.13.2 and v1.101503.4, respectively. Additionally, an informational callout about a missed override flag for op-node that was to be added in the mainnet release is removed. All other upgrade instructions, configuration steps, and warnings remain unchanged.

Possibly related PRs

• docs: fjord upgrade completed. #888: Updates documentation related to network upgrades by removing informational callouts and adjusting activation timestamps for mainnet and Sepolia, indicating related changes in upgrade communication and timing.
• U15: New absolute prestate and op-challenger #1576: Adds an informational callout about Mainnet node binaries availability and updates version numbers, which this PR removes or modifies for the same upgrade notice file.
• Sb/u15 callout #1560: Adds an informational callout about a missed override flag for op-node that this PR removes, directly modifying the same content in pages/notices/upgrade-15.mdx.

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[sbvegan]

I added one suggestion that I think adds some clarity. Feel free to merge when you feel this is ready.