Update resource_gallery.yaml (ProjectPythia#486)

* Update resource_gallery.yaml

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: jukent

portal/resource_gallery.yaml

@@ -1496,7 +1496,8 @@
     - matplotlib
     - numpy
     - pandas
-    formats: code
+    formats:
+    - code
     domains:
     - Earth System Science
     - Chemical Oceanography