v1.31.3

What's Changed

• Cherry-pick #11090: Add panic handlers to matching handler APIs by @rkannan82 in #11106
• [v1.31] Add Nexus callback source header inspection toggle by @bergundy in #11982
• Upgrade go.temporal.io/auto-scaled-workers to v0.0.0-1.31.2 by @simvlad in #12037
• Cherry-pick PRs labeled for v1.31.3 release by @simvlad in #12039
• Bump Go to 1.26.8 on release/v1.31.x (security patch) by @simvlad in #12058
• Prepare v1.31.3: version bump and security fixes by @simvlad in #12063
• Cherry-pick: List matching perf (#11014) to release/v1.31.x by @davidporter-id-au in #12069

Full Changelog: v1.31.2...v1.31.3