upgrade gha runners to ubuntu 22.04

Author: tim-mwangi

.github/workflows/pr-test.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         go: ["1.22", "1.23"]
@@ -59,7 +59,7 @@ jobs:
         run: make check-examples
 
   security:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@master
       - name: Run Snyk to check for vulnerabilities