Use CBMC version 5.95.1 (FreeRTOS#1226)

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

Co-authored-by: Rahul Kar <118818625+kar-rahul-aws@users.noreply.github.com>
Co-authored-by: Nikhil Kamath <110539926+amazonKamath@users.noreply.github.com>

.github/workflows/ci.yml

@@ -168,6 +168,8 @@ jobs:
 
       - 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