Adding CI support for Swift 5.10

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: mergesort

.github/workflows/swift.yml

@@ -23,3 +23,24 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - run: ASAN_OPTIONS=detect_leaks=0 swift test --sanitize=address
+  focal-5-10:
+    container:
+      image: swift:5.10-focal
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - run: swift test
+  thread-5-10:
+    container:
+      image: swift:5.10-focal
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - run: swift test --sanitize=thread
+  address-5-10:
+    container:
+      image: swift:5.10-focal
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - run: ASAN_OPTIONS=detect_leaks=0 swift test --sanitize=address