bug-1973186: Upgrade Stackwalker to version 0.26.0. (#23)

Author: smarnach

bin/build_stackwalker.sh

@@ -14,8 +14,8 @@
 set -euo pipefail
 
 # From: https://github.com/rust-minidump/rust-minidump
-MINIDUMPREV=v0.25.0
-MINIDUMPREVDATE=2025-03-19
+MINIDUMPREV=v0.26.0
+MINIDUMPREVDATE=2025-06-20
 
 TARFILE="socorro-stackwalker.${MINIDUMPREVDATE}.${MINIDUMPREV}.tar.gz"