Prepare for Pectra fork

[PabloCastellano]

Pectra upgrade will increase the number of blobs to 6/9.

Pectra Schedule

• Holesky will fork at slot 3710976 (Mon, Feb 24 at 21:55:12 UTC)
• Sepolia will fork at slot 7118848 (Wed, Mar 5 at 07:29:36 UTC)
• Ethereum mainnet: March 2025 (TBD on March 6th)

Make sure Blobscan is ready for this change. We might need to update some constants and logic in apps/web/src/utils/ethereum.ts:

blobscan/apps/web/src/utils/ethereum.ts

Lines 3 to 8 in 31be3e0

	export const GAS_PER_BLOB = 131_072; // 2 ** 17
	export const BLOB_SIZE = GAS_PER_BLOB;
	export const TARGET_BLOB_GAS_PER_BLOCK = 393_216;
	export const TARGET_BLOBS_PER_BLOCK = TARGET_BLOB_GAS_PER_BLOCK / GAS_PER_BLOB;
	export const BLOB_GAS_LIMIT_PER_BLOCK = 786_432;
	export const MAX_BLOBS_PER_BLOCK = BLOB_GAS_LIMIT_PER_BLOCK / GAS_PER_BLOB;

TODO:

• use a switch to use gas target depending on block number
• api indexer endpoint: update calculus to determine base fee
• ui: update gas target component