fix(users/Profpatsch/whatcd-resolver): pin to postgres 14

I haven’t thought about how to migrate this when the postgres version
changes, so for now we just pin to 14 and worry about it when we reach
EOL lol

Change-Id: Ib72ec7835c660db636a95fb5af8c9ce40897b1ce
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11085
Tested-by: BuildkiteCI
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>

users/Profpatsch/shell.nix

@@ -60,7 +60,7 @@ pkgs.mkShell {
     pkgs.rustup
     pkgs.pkg-config
     pkgs.fuse
-    pkgs.postgresql
+    pkgs.postgresql_14
     pkgs.nodejs
     pkgs.ninja
   ];
@@ -94,4 +94,5 @@ pkgs.mkShell {
       depot.third_party.rust-crates.nom
     ]}"
     ];
+
 }