vscode: update the updaters!

Now they use update-shell.nix auxiliar file.

pkgs/applications/editors/vscode/extensions/vscode-lldb/update.sh

···
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash -p jq nix-prefetch
+#! /usr/bin/env nix-shell
+#! nix-shell ../../update-shell.nix -i bash
+
 set -eo pipefail
 cd "$(dirname "${BASH_SOURCE[0]}")"
 if [[ $# -ne 1 ]]; then
···
 of https://github.com/vadimcn/llvm-project and update lldb with correct version of LLVM.
 "
 
-nixpkgs=../../../..
+# Ideally, nixpkgs points to default.nix file of Nixpkgs official tree
+nixpkgs=../../../../../..
 nixFile=./default.nix
 owner=vadimcn
 repo=vscode-lldb

pkgs/applications/editors/vscode/update-shell.nix

···
+{ pkgs ? import ../../../.. { } }:
+
+# Ideally, pkgs points to default.nix file of Nixpkgs official tree
+with pkgs;
+
+mkShell {
+  packages = [
+    bash
+    curl
+    gawk
+    gnugrep
+    gnused
+    jq
+    nix
+    nix-prefetch
+    nix-prefetch-scripts
+  ];
+}

pkgs/applications/editors/vscode/update-vscode.sh

···
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash -p curl jq gnused
+#! /usr/bin/env nix-shell
+#! nix-shell update-shell.nix -i bash
 
 # Update script for the vscode versions and hashes.
 # Usually doesn't need to be called by hand,

pkgs/applications/editors/vscode/update-vscodium.sh

···
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash -p curl gnugrep gnused gawk
+#! /usr/bin/env nix-shell
+#! nix-shell update-shell.nix -i bash
 
 # Update script for the vscode versions and hashes.
 # Usually doesn't need to be called by hand,