package.json: upgrade esbuild

Fixes #2668

Change-Id: I26c72a0cc5b268a277b57c019f7253d120144f7a
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/469915
TryBot-Result: kokoro <[email protected]>
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>
Run-TryBot: Jamal Carvalho <[email protected]>

Author: jamalc