ci: ignore sources.json changes

it's unnecessary and can loop due to the niv update commit

.github/workflows/niv-update.yml

@@ -91,15 +91,13 @@ name: niv-update
 'on':
   pull_request:
     paths:
-    - nix/*
     - default.nix
-    - ./ci/niv-cron.nix
+    - ci/niv-cron.nix
     - .github/workflows/niv-update.yml
   push:
     paths:
-    - nix/*
     - default.nix
-    - ./ci/niv-cron.nix
+    - ci/niv-cron.nix
     - .github/workflows/niv-update.yml
   schedule:
   - cron: 0 */6 * * *

ci/niv-cron.nix

@@ -10,9 +10,8 @@ with lib; {
   gh-actions = {
     on = let
       paths = [
-        "nix/*" # niv and sources.json
         "default.nix" # sourceCache
-        config.ci.configPath config.ci.gh-actions.path
+        "ci/niv-cron.nix" config.ci.gh-actions.path
       ];
     in {
       push = {