chore(ci): update SMP CLI to 0.26.1 (#24865)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: GeorgeHahn

.github/workflows/regression.yml

@@ -109,7 +109,7 @@ jobs:
       - name: Set SMP version
         id: experimental-meta
         run: |
-          export SMP_CRATE_VERSION="0.25.1"
+          export SMP_CRATE_VERSION="0.26.1"
           echo "smp crate version: ${SMP_CRATE_VERSION}"
           echo "SMP_CRATE_VERSION=${SMP_CRATE_VERSION}" >> $GITHUB_OUTPUT