chore: modernize the codebase using go 1.26 (#278)

This runs:

```
go run golang.org/x/tools/gopls/internal/analysis/modernize/cmd/modernize@latest -fix ./...
```

over the codebase, as this is using go 1.26, it can also use the new
new() functionallity so AsPtr and boolPtr is are needed anymore.

Signed-off-by: Miek Gieben <miek@miek.nl>

internal/proxy/proxy.go

@@ -116,7 +116,7 @@ func (p *Proxy) handleConnection(ctx context.Context, localConn net.Conn) {
 	}()
 
 	// Wait for both copies to complete or context cancel.
-	for i := 0; i < 2; i++ {
+	for range 2 {
 		select {
 		case <-ctx.Done():
 			// Close connections to abort ongoing copies.