chore: migrate instead of delete old labels (#95)

Easier than PR suggestions. I noticed that some useful labels were being
deleted either entirely or to be replaced with effectively the same
thing.

---------

Signed-off-by: Arran Schlosberg <[email protected]>
Co-authored-by: Quentin McGaw <[email protected]>

Author: ARR4N

.github/labels.yml

@@ -66,3 +66,7 @@
 - name: "Closed: ⚰️ Inactive"
   color: "959a9c"
   description: "No answer was received for weeks"
+- name: "Closed: 🙅 Won't fix"
+  color: "959a9c"
+- name: "Closed: 🧺 Invalid"
+  color: "959a9c"