ci: regenerate codemirror languages on renovate npm updates (#38267)

Adds `make generate-codemirror-languages` to the npm group's
`postUpgradeTasks` in `renovate.json5`, so renovate regenerates
`assets/codemirror-languages.json` whenever `@codemirror/language-data`
(or any npm dep) updates — mirroring the existing `make svg` handling.

Also reformats the `fileFilters` arrays multi-line and regenerates the
asset to pick up current upstream linguist languages.

assets/codemirror-languages.json

@@ -436,6 +436,7 @@
       "jsonl",
       "mcmeta",
       "sarif",
+      "slnlaunch",
       "tact",
       "tfstate",
       "topojson",
@@ -691,10 +692,17 @@
     "extensions": [
       "ini",
       "cnf",
+      "container",
       "dof",
       "lektorproject",
+      "mount",
+      "network",
       "prefs",
       "properties",
+      "service",
+      "socket",
+      "target",
+      "timer",
       "url",
       "conf"
     ],