Use CBMC version 5.95.1 (#108)

The upcoming CBMC version 6 release includes changes that may affect
existing proofs. This PR will make sure that coreMQTT-Agent PRs are not
negatively impacted by this release. After releasing CBMC version 6 we
will issue a follow-up PR that will return coreMQTT-Agent to using
CBMC's latest release, and will include any changes to proofs that may
be necessary to support the new version.

Author: tautschnig

.github/workflows/ci.yml

@@ -192,6 +192,8 @@ jobs:
     steps:
       - name: Set up CBMC runner
         uses: FreeRTOS/CI-CD-Github-Actions/set_up_cbmc_runner@main
+        with:
+          cbmc_version: "5.95.1"
       - name: Run CBMC
         uses: FreeRTOS/CI-CD-Github-Actions/run_cbmc@main
         with: