provide vendor dir for nix

vendor/github.com/sagikazarmark/slog-shim/text_handler_120.go

@@ -0,0 +1,24 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !go1.21
+
+package slog
+
+import (
+	"io"
+
+	"golang.org/x/exp/slog"
+)
+
+// TextHandler is a Handler that writes Records to an io.Writer as a
+// sequence of key=value pairs separated by spaces and followed by a newline.
+type TextHandler = slog.TextHandler
+
+// NewTextHandler creates a TextHandler that writes to w,
+// using the given options.
+// If opts is nil, the default options are used.
+func NewTextHandler(w io.Writer, opts *HandlerOptions) *TextHandler {
+	return slog.NewTextHandler(w, opts)
+}