[newlib-cygwin/cygwin-3_6-branch] Add recent two fixes into release note

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=9a768521774b13cf8178282deba2ce35a8f3a78b

commit 9a768521774b13cf8178282deba2ce35a8f3a78b
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Fri May 29 11:27:55 2026 +0900

    Add recent two fixes into release note
    
    (cherry picked from commit e3cf6a9302d0cfc28eaad7556b0ce739b8641ae8)

Diff:
---
 winsup/cygwin/release/3.6.10 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/winsup/cygwin/release/3.6.10 b/winsup/cygwin/release/3.6.10
new file mode 100644
index 000000000..a6647a822
--- /dev/null
+++ b/winsup/cygwin/release/3.6.10
@@ -0,0 +1,7 @@
+Fixes:
+------
+
+- Fix deadlock in console teardown that arises from pseudo console.
+  Addresses: https://github.com/msys2/msys2-runtime/issues/338
+
+- Fix handling of surrogate pair in legacy console.