Update ubuntu version

Author: yngvar-antonsson

.github/workflows/test.yml

@@ -15,12 +15,12 @@ jobs:
           - '2.7'
           - '2.8'
           - '2.10'
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     env:
       CMAKE_LDOC_FIND_REQUIRED: 'YES'
     steps:
-      - uses: actions/checkout@v3
-      - uses: tarantool/setup-tarantool@v2
+      - uses: actions/checkout@v4
+      - uses: tarantool/setup-tarantool@v3
         with:
           tarantool-version: ${{ matrix.tarantool }}
 
@@ -32,5 +32,5 @@ jobs:
       - run: echo ".rocks/bin" >> $GITHUB_PATH
 
       - run: tarantoolctl rocks make
-      - run: .rocks/bin/luatest -v
+      - run: .rocks/bin/luatest -v --coverage
       - run: luacheck .