Unpin urllib3, pin anaconda-client>=1.12.0

This is a follow-up to bc2dbd5 now that
the latest version of anaconda-client supports latest urllib3 ¹.

¹ https://github.com/Anaconda-Platform/anaconda-client/blob/2a3ce88c8c37a2ea4276a0135e707e51e1015b66/CHANGELOG.md#1120---2023-07-18

devel/setup

@@ -18,7 +18,7 @@ remove() {
 
 create() {
     local -a pkgs=(
-        anaconda-client
+        "anaconda-client>=1.12.0"
         boa
 
         # for manipulating recipe.yaml with jq
@@ -37,9 +37,6 @@ create() {
         curl
         wget
 
-        # Temporary pin until anaconda-client fixes dependency upstream
-        "urllib3<2"
-
         # Temporary pin until boa fixes dependency upstream
         # <https://github.com/mamba-org/boa/issues/376>
         "ruamel.yaml<0.18.0"