[nix] Upgrade to latest version of nixpkgs-unstable

Summary: This updates to the latest version of nixpkgs-unstable. This is in response to the need to update localstack from 1.4.0 to >2.3.2.

Test Plan: Successfully ran `nix develop` with working build environment

Reviewers: ashoat, varun, bartek, atul, O1 Nix

Reviewed By: ashoat, bartek, atul

Subscribers: atul, ashoat, tomek

Differential Revision: https://phab.comm.dev/D10561

flake.nix

@@ -26,6 +26,7 @@
       in
         import nixpkgs-unstable {
           inherit system;
+          config.allowUnfree = true;
           overlays = overlays ++ [
             # Re-introduce older packages that were removed in latest nixpkgs
             (_: _: {

keyserver/.nvmrc

@@ -1 +1 @@
-18.12.1
+20.10.0

keyserver/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:18.12.1-bullseye
+FROM node:20.10.0-bullseye
 
 #-------------------------------------------------------------------------------
 # STEP 0: SET UP USER

native/ios/Podfile.lock

@@ -948,4 +948,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: 8b75c667b4679ba1a92a975823401ba7614ea7a1
 
-COCOAPODS: 1.12.1
+COCOAPODS: 1.14.3

nix/dev-shell.nix

@@ -1,10 +1,8 @@
 { mkShell
 , stdenv
 , lib
-, amqp-cpp
 , awscli2
 , arcanist
-, aws-sdk-cpp
 , better-prompt
 , boost
 , bundler
@@ -21,7 +19,6 @@
 , fmt
 , glog
 , grpc
-, gtest
 , libiconv
 , libuv
 , localstack
@@ -80,7 +77,6 @@ mkShell {
     cargo-udeps
 
     # Tunnelbroker + CMake
-    amqp-cpp
     c-ares_cmake-config
     cmake
     cmake-format # linting
@@ -100,11 +96,9 @@ mkShell {
     # protobuf exposes both a library and a command
     # thus should appear in both inputs
     protobuf3_21
-    aws-sdk-cpp # tunnelbroker
     corrosion # tunnelbroker
     double-conversion # tunnelbroker
     glog # tunnelbroker
-    gtest # testing services
     folly # cpp tools
     fmt # needed for folly
     boost # needed for folly

services/electron-update-server/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:16.18.0-bullseye
+FROM node:20.10.0-bullseye
 
 WORKDIR /home/comm/