CI: Use a Python release available on Ubuntu 26.04 for RAT

.github/workflows/license.yml

diff --git a/.github/workflows/license.yml b/.github/workflows/license.yml
index 9116394..7854b08 100644
--- a/.github/workflows/license.yml
+++ b/.github/workflows/license.yml
@@ -40,7 +40,7 @@
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: "3.14"
       - name: Audit licenses
         run: ./dev/release/run-rat.sh .
       - name: Verify release tarball excludes fuzz seeds