Test with Go 1.18.3 in CI

Author: BooleanCat

.github/workflows/test.yaml

@@ -8,7 +8,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v2
-        with: { go-version: "1.18.0" }
+        with: { go-version: "1.18.3" }
       - run: make check
   test:
     strategy:
@@ -18,5 +18,5 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v2
-        with: { go-version: "1.18.0" }
+        with: { go-version: "1.18.3" }
       - run: make test