ci/zenodo.json5: remove "grants" specification

Zenodo's grants database, which seems to come from OpenAIRE, is
incomplete, and it turns out that it will reject metadata associated
with grants not in the database. Too bad. I filed:

https://github.com/zenodo/zenodo/issues/2371

to ask a few questions about the whole situation.

ci/zenodo.json5

@@ -35,10 +35,13 @@ at <a href="https://wwt-data-formats.readthedocs.io/">the wwt_data_formats websi
     access_right: 'open',
     license: 'MIT', // see https://spdx.org/licenses/
 
-    grants: [
-      // National Science Foundation:
-      {id: '10.13039/100000001::2004840'},
-    ],
+    // Relevant grants are currently (2022 Aug) missing from Zenodo's database
+    // so we don't include them for now.
+    //
+    // grants: [
+    //   // National Science Foundation:
+    //   {id: '10.13039/100000001::2004840'},
+    // ],
 
     // Keywords use an uncontrolled vocabulary (and so are of limited usefulness):
     keywords: [