internal/worker/log: replace exp/slog with log/slog

We started using golang.org/x/exp/slog in commit b2b721d
("internal/worker/log: use slog"). Since we test one Go version back (Go
1.22), and log/slog was released in Go 1.21, we can safely replace
golang.org/x/exp/slog with log/slog.

Change-Id: I36fec562cb7d0a1e08bcd35a25b8a983343e5732
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/646115
Auto-Submit: Damien Neil <[email protected]>
Reviewed-by: Damien Neil <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: qiu laidongfeng2 <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: Juneezee

internal/observe/observe.go

@@ -8,7 +8,7 @@ package observe
 
 import (
 	"context"
-	"golang.org/x/exp/slog"
+	"log/slog"
 	"net/http"
 	"strings"
 

internal/worker/log/log.go

@@ -8,8 +8,8 @@ package log
 import (
 	"context"
 	"fmt"
-	"golang.org/x/exp/slog"
 	"io"
+	"log/slog"
 	"os"
 	"time"
 )

internal/worker/log/log_test.go

@@ -8,7 +8,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"golang.org/x/exp/slog"
+	"log/slog"
 	"testing"
 	"time"
 )