package.json: update gts (4.0.0), moment (2.29.4)

gts 4.0.0 supports eslint 8.x that is compatible with typescript 4.6+.
https://github.com/google/gts/releases/tag/v4.0.0
(npm install --save-dev gts@4.0.0)

This update also removes the dependency on got (CVE-2022-33987).

Update moment to 2.29.4 (npm audit fix)
https://github.com/moment/moment/blob/HEAD/CHANGELOG.md#2294

Change-Id: I2668fd1cf359c4df4fc16b50c96237ae110660b1
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/416615
Reviewed-by: Jamal Carvalho <jamal@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>

Author: hyangah