Update NEWS.md and AUTHORS for 1.8.1 (#3353)

NEWS.md

@@ -1,3 +1,36 @@
+# 1.8.1
+
+This is a patch release to fix security, performance, and build issues found in 1.8.0.
+Full commit log can be found at <https://github.com/jqlang/jq/compare/jq-1.8.0...jq-1.8.1>.
+
+## Security fixes
+
+- CVE-2025-49014: Fix heap use after free in `f_strftime`, `f_strflocaltime`.
+  @wader 499c91bca9d4d027833bc62787d1bb075c03680e
+- GHSA-f946-j5j2-4w5m: Fix stack overflow in `node_min_byte_len` of oniguruma.
+  @wader 5e159b34b179417e3e0404108190a2ac7d65611c
+
+## CLI changes
+
+- Fix assertion failure when syntax error happens at the end of the query. @itchyny #3350
+
+## Changes to existing functions
+
+- Fix portability of `strptime/1` especially for Windows. @itchyny #3342
+
+## Language changes
+
+- Revert the change of `reduce`/`foreach` state variable in 1.8.0 (#3205).
+  This change was reverted due to serious performance regression. @itchyny #3349
+
+## Documentation changes
+
+- Add LICENSE notice of NetBSD's `strptime()` to COPYING. @itchyny #3344
+
+## Build improvements
+
+- Fix build on old Mac with old sed. @qianbinbin #3336
+
 # 1.8.0
 
 We are pleased to announce the release of version 1.8.0.