build: update development Node.js version to 22.15.0 (angular#31091)

alan-agius4 · web-flow · commit f1a2925baba5 · 2025-05-12T14:18:10.000+02:00
The version of Node.js used for development and CI jobs is now set to the active LTS version's latest minor and patch.

This is the same as all other repos
diff --git a/.nvmrc b/.nvmrc
@@ -1 +1 @@
-22.11.0
+22.15.0
diff --git a/docs/.nvmrc b/docs/.nvmrc
@@ -1 +1 @@
-20.16.0
+22.15.0
