Release: v1.21.0

Weekly release for May 18 2023

What's Changed

• feat(s2n-quic-xdp): export default BPF programs by @camshaft in #1748
• feat(s2n-quic-xdp): add IO implementations by @camshaft in #1741
• feat(s2n-quic-core): add generic IO event loop by @camshaft in #1740
• chore(netbench): bump MSRV to 1.65.0 by @camshaft in #1757
• feat(s2n-quic): Stabilize congestion control provider and allow for custom congestion controllers by @WesleyRosenblum in #1758
• fix(s2n-quic-core): skip check in spsc cursors before loading peer value by @camshaft in #1760
• build(deps): switch cache-padded to crossbeam-utils by @maddeleine in #1762
• feat(s2n-quic): add experimental XDP IO provider by @camshaft in #1749
• feat(s2n-quic-xdp): add syscall for NIC queues by @camshaft in #1755
• ci: fix release workflow by @camshaft in #1763
• chore: release version bump by @maddeleine in #1764

Full Changelog: v1.20.0...v1.21.0