feat(inko): add support for "for" loops

These will be introduced as part of the 0.19.0 release. This commit
updates the lockfile as well as the relevant queries to accommodate the
new expression and "in" now being a keyword.

lockfile.json

@@ -363,7 +363,7 @@
     "revision": "962568c9efa71d25720ab42c5d36e222626ef3a6"
   },
   "inko": {
-    "revision": "4d057a5c24d715b211c3c82de2526f041b4af66f"
+    "revision": "f58a87ac4dc6a7955c64c9e4408fbd693e804686"
   },
   "ipkg": {
     "revision": "8d3e9782f2d091d0cd39c13bfb3068db0c675960"

queries/inko/folds.scm

@@ -7,6 +7,7 @@
   (define_field)
   (define_variable)
   (external_function)
+  (for)
   (if)
   (import)+
   (loop)

queries/inko/highlights.scm

@@ -56,6 +56,7 @@
   "copy"
   "for"
   "impl"
+  "in"
   "inline"
   "let"
   "move"