include SSL CA in docs

docs/installation.md

@@ -57,6 +57,7 @@ Launch a new shell. Then use Nix to switch to the macOS configuration:
 ```bash
 sudo rm /etc/bashrc
 sudo rm /etc/nix/nix.conf
+export NIX_SSL_CERT_FILE="$HOME/Documents/t2-ca-bundle.pem"
 nix \
     --extra-experimental-features flakes \
     --extra-experimental-features nix-command \

overlays/gh-collaborators.nix

@@ -1,6 +1,6 @@
 _final: prev: {
 
-  gh-collaborators = prev.buildGo120Module rec {
+  gh-collaborators = prev.buildGo122Module rec {
     pname = "gh-collaborators";
     version = "2.0.2";