niv org-mode: update 40474827 -> 7bc18ebb

## Changelog for org-mode:
Commits: [emacs-straight/org-mode@40474827...7bc18ebb](emacs-straight/org-mode@4047482...7bc18eb)

* [`66537267`](emacs-straight/org-mode@6653726) org-num: Add tests
* [`30a50d1c`](emacs-straight/org-mode@30a50d1) ob-python: Fix discrepancy of single/multi-line code blocks
* [`632ceabb`](emacs-straight/org-mode@632ceab) ob-python: Refactor session evaluation
* [`e8ebf5d6`](emacs-straight/org-mode@e8ebf5d) Add other-tab option for org-agenda-window-setup
* [`7bc18ebb`](emacs-straight/org-mode@7bc18eb) ob-core: Avoid table conversion warning for empty results

nix/sources.json

@@ -137,10 +137,10 @@
         "homepage": "https://code.orgmode.org/bzg/org-mode",
         "owner": "emacs-straight",
         "repo": "org-mode",
-        "rev": "40474827eade4ab4d3667b4dde5f0833562c7b87",
-        "sha256": "1qzg4690jp28cy6lzmzrz9ndkhqw11j7px9krpza441q2byhgs5x",
+        "rev": "7bc18ebbed409ace4665ec9c9910b2837834b03d",
+        "sha256": "1jn9jfliymvh8s7szzsybkhm4z3g7bw2zvc15k5waskn4zw07pph",
         "type": "tarball",
-        "url": "https://github.com/emacs-straight/org-mode/archive/40474827eade4ab4d3667b4dde5f0833562c7b87.tar.gz",
+        "url": "https://github.com/emacs-straight/org-mode/archive/7bc18ebbed409ace4665ec9c9910b2837834b03d.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "org-yt": {