Use ubunut-26.04 job for the cargo workflow (#39)

Author: emmatyping

.github/workflows/cargo.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   build:
     timeout-minutes: 15
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with: