labeler: merge "logind" label into "login"

Existing issues/PRs were migrated to the login label using:
$ gh search issues --repo systemd/systemd --label logind --limit=1000 --json number -q .[].number | \
        xargs gh issue edit --add-label login --remove-label logind

.github/advanced-issue-labeler.yml

@@ -64,7 +64,7 @@ policy:
           - name: kernel-install
             keys: ['kernel-install']
 
-          - name: logind
+          - name: login
             keys: ['systemd-logind', 'loginctl', 'pam_systemd']
 
           - name: machined

.github/labeler.yml

@@ -66,10 +66,7 @@ journal-remote:
     - any-glob-to-any-file: 'src/journal-remote/*'
 login:
   - changed-files:
-    - any-glob-to-any-file: '**/sd-login*/**'
-logind:
-  - changed-files:
-    - any-glob-to-any-file: 'src/login/*'
+    - any-glob-to-any-file: ['src/login/*', '**/sd-login*/**']
 meson:
   - changed-files:
     - any-glob-to-any-file: ['meson_options.txt', '**/meson.build']