ci: Bumps CI to newer swift versions

Author: NeedleInAJayStack

.github/workflows/test.yml

@@ -33,30 +33,14 @@ jobs:
         run: swift build
       - name: Run tests
         run: swift test
-        
-  # ubuntu-latest is ubuntu-22.04 currently. Swift versions older than 5.7 don't have builds for 22.04. https://www.swift.org/download/ 
-  ubuntu-old:
-    name: Build ${{ matrix.swift }} on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-20.04] 
-        swift: ["5.4", "5.5", "5.6"]
-    steps:
-    - uses: swift-actions/setup-swift@v1
-      with:
-        swift-version: ${{ matrix.swift }}
-    - uses: actions/checkout@v3
-    - name: Test
-      run: swift test
 
   ubuntu-latest:
     name: Build ${{ matrix.swift }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest] 
-        swift: ["5.7"]
+        os: [ubuntu-latest]
+        swift: ["5.8", "5.9", "5.10"]
     steps:
     - uses: swift-actions/setup-swift@v1
       with: