Rollup merge of rust-lang#80219 - camelid:library_tracking_issue-labels, r=m-ou-se

Fix labels for 'Library Tracking Issue' template

Each label needs to be separated by a comma (see the ICE issue template
for an example of correct usage).

r? `````@m-ou-se`````

Author: GuillaumeGomez

.github/ISSUE_TEMPLATE/library_tracking_issue.md

@@ -2,7 +2,7 @@
 name: Library Tracking Issue
 about: A tracking issue for an unstable library feature.
 title: Tracking Issue for XXX
-labels: C-tracking-issue T-libs
+labels: C-tracking-issue, T-libs
 ---
 <!--
 Thank you for creating a tracking issue!