chore: release 3.26.0-0codspeed6

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: adriencaccia

debian/changelog

@@ -1,3 +1,10 @@
+valgrind (1:3.26.0-0codspeed6) UNRELEASED; urgency=medium
+
+  * fix: hangs on ARM64 due to atomics (#23)
+  * fix(aspacem): raise amd64 managed address ceiling to 1 TiB (#22)
+
+ -- Adrien Cacciaguerra <adrien@codspeed.io>  Thu, 09 Jul 2026 16:24:08 +0000
+
 valgrind (1:3.26.0-0codspeed5) UNRELEASED; urgency=medium
 
   * fix(debuginfo): find split debug files via NIX_DEBUG_INFO_DIRS