0.30.x: update deprecation versions and bump minor version#808

apoelstra wants to merge 2 commits intorust-bitcoin:secp256k1-0.30.xrust-bitcoin/rust-secp256k1:secp256k1-0.30.xfrom

apoelstra:2025-06_tbd_0_30_0apoelstra/rust-secp256k1:2025-06_tbd_0_30_0Copy head branch name to clipboard