Replace manual pushover migration with drizzle-generated version

src/db/migrations/0062_open_proudstar.sql

@@ -0,0 +1 @@
+ALTER TYPE "public"."provider_kind" ADD VALUE 'pushover';

src/db/migrations/meta/_journal.json

@@ -435,6 +435,13 @@
       "when": 1780822414802,
       "tag": "0061_illegal_mole_man",
       "breakpoints": true
+    },
+    {
+      "idx": 62,
+      "version": "7",
+      "when": 1781854323074,
+      "tag": "0062_open_proudstar",
+      "breakpoints": true
     }
   ]
 }