v26.6.0

Notes The Nimbus consensus client v26.6.0 is a medium-urgency release which improves performance and resilience. Improvements Add column index to light client database to improve pruning performance: #8626 Initiate execution client processing of block payloads while waiting for columns: #8561 Avoid redundant KZG column verification: #8542 Require at most 64 columns for block data availability…