Update test platform from ubuntu-20.04 to ubuntu-latest

Author: danielinux

.github/workflows/test-build-sim-tpm.yml

@@ -26,7 +26,7 @@ on:
 jobs:
 
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
       # setup ibmswtpm2

.github/workflows/test-custom-tlv-simulator.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   custom_tlv_simulator_tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/test-powerfail-simulator.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   powerfail_simulator_tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v3