Fixing an incorrect Naver OAuth2 endpoint URLs:

AuthURL : https://developers.naver.com/docs/login/devguide/devguide.md#3-4-2-%EB%84%A4%EC%9D%B4%EB%B2%84-%EB%A1%9C%EA%B7%B8%EC%9D%B8-%EC%97%B0%EB%8F%99-url-%EC%83%9D%EC%84%B1%ED%95%98%EA%B8%B0
TokenURL : https://developers.naver.com/docs/login/devguide/devguide.md#3-4-4-%EC%A0%91%EA%B7%BC-%ED%86%A0%ED%81%B0-%EB%B0%9C%EA%B8%89-%EC%9A%94%EC%B2%AD

Change-Id: Ie4e0f826af1854d3400525509d5d748ca8b8df74
GitHub-Last-Rev: b59d49a
GitHub-Pull-Request: #784
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/694235
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Sean Liao <sean@liao.dev>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

By now Go 1.25.0 has been released, and Go 1.23 is no longer supported
per the Go Release Policy (see https://go.dev/doc/devel/release#policy).

For golang/go#69095.

[git-generate]
(cd . && go get go@1.24.0 && go mod tidy && go fix ./... && go mod edit -toolchain=none)

Change-Id: I9f54f22bd309b9f22524355294e844c9615a6281
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/695755
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>