Update CI to Go 1.23, remove exception for fuzzer

Author: arp242

.github/workflows/test.yml

@@ -5,19 +5,19 @@
     "test": {
       "strategy": {
         "matrix": {
-          "go-version": ["1.18.x", "1.22.x"],
+          "go-version": ["1.18.x", "1.23.x"],
           "os":         ["ubuntu-latest", "macos-latest", "windows-latest"]
         }
       },
       "runs-on": "${{ matrix.os }}",
       "env": {"GOPROXY": "direct"},
       "steps": [{
           "name": "Install Go",
-          "uses": "actions/setup-go@v3",
+          "uses": "actions/setup-go@v4",
           "with": {"go-version": "${{ matrix.go-version }}"}
         }, {
           "name": "Checkout code",
-          "uses": "actions/checkout@v3"
+          "uses": "actions/checkout@v4"
         }, {
           "name": "Test",
           "run":  "go test -race ./..."

ossfuzz/fuzz.go

@@ -3,7 +3,6 @@ package ossfuzz
 import (
 	"bytes"
 	"fmt"
-	"strings"
 
 	"github.com/BurntSushi/toml"
 )
@@ -28,11 +27,6 @@ func FuzzToml(data []byte) int {
 	var v2 any
 	_, err = toml.Decode(buf.String(), &v2)
 	if err != nil {
-		// TODO(manunio): remove this when 1.23 lands, see #407.
-		if strings.Contains(err.Error(), "invalid datetime") {
-			return 0
-		}
-
 		panic(fmt.Sprintf("failed round trip: %s", err))
 	}