pmb.config: Adjust pmaports URLs to postmarketOS GitLab

We moved from gitlab.com to gitlab.postmarketos.org.

@caleb @ollieparanoid I'm not sure if this is enough per se given that users' local pmaports repos won't automatically be migrated to this new remote URL I think?

pmb/config/__init__.py

@@ -570,8 +570,8 @@ git_repos = {
         "git@gitlab.alpinelinux.org:alpine/aports.git",
     ],
     "pmaports": [
-        "https://gitlab.com/postmarketOS/pmaports.git",
-        "git@gitlab.com:postmarketos/pmaports.git",
+        "https://gitlab.postmarketos.org/postmarketOS/pmaports.git",
+        "git@gitlab.postmarketos.org:postmarketOS/pmaports.git",
     ],
 }