Fix ubuntu version in CI workflows

Author: urmastalimaa

.github/workflows/ci.yml

@@ -9,9 +9,8 @@ on:
 jobs:
   test:
     name: Build and test
-    runs-on: ubuntu-latest
-
-    steps:
+    runs-on: ubuntu-22
+  steps:
       - uses: actions/checkout@v2
       - name: Set up Elixir
         uses: erlef/setup-beam@v1.15
@@ -35,7 +34,7 @@ jobs:
 
   dialyzer:
     name: Run Dialyzer for type checking
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22
     steps:
       - uses: actions/checkout@v2
       - name: Set mix file hash

.github/workflows/deploy.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   Publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22
     env:
       HEX_API_KEY: ${{ secrets.HEXPM_SECRET }}
     steps: