Update libtinfo dependency in CI

Author: dtolnay

.github/workflows/bindgen.yml

@@ -197,7 +197,7 @@ jobs:
         if: matrix.os == 'ubuntu-latest'
         run: |
           sudo apt-get update
-          sudo apt-get install libtinfo5
+          sudo apt-get install libtinfo6
       - name: Run all the tests
         env:
           GITHUB_ACTIONS_OS: ${{matrix.os}}