docs: update nodejs required version (#71469)

* docs: update nodejs required version

* docs: update nodejs version in plugin tutorials

* docs: update to LTS guidance

docs/sources/developers/plugins/create-a-grafana-plugin/develop-a-plugin/build-a-data-source-backend-plugin.md

@@ -31,7 +31,7 @@ In this tutorial, you'll:
 - Grafana 7.0
 - Go ([Version](https://github.com/grafana/plugin-tools/blob/main/packages/create-plugin/templates/backend/go.mod#L3))
 - [Mage](https://magefile.org/)
-- NodeJS ([Version](https://github.com/grafana/plugin-tools/blob/main/packages/create-plugin/templates/common/package.json#L66))
+- [LTS](https://nodejs.dev/en/about/releases/) version of Node.js
 - yarn
   {{% /class %}}
 

docs/sources/developers/plugins/create-a-grafana-plugin/develop-a-plugin/build-a-data-source-plugin.md

@@ -25,7 +25,7 @@ In this tutorial, you'll:
 ### Prerequisites
 
 - Grafana >=7.0
-- NodeJS >=14
+- [LTS](https://nodejs.dev/en/about/releases/) version of Node.js
 - yarn
   {{% /class %}}
 

docs/sources/developers/plugins/create-a-grafana-plugin/develop-a-plugin/build-a-panel-plugin-with-d3.md

@@ -28,7 +28,7 @@ In this tutorial, you'll:
 ### Prerequisites
 
 - Grafana 7.0
-- NodeJS 12.x
+- [LTS](https://nodejs.dev/en/about/releases/) version of Node.js
 - yarn
   {{% /class %}}
 

docs/sources/developers/plugins/create-a-grafana-plugin/develop-a-plugin/build-a-panel-plugin.md

@@ -23,7 +23,7 @@ For more information about panels, refer to the documentation on [Panels](/docs/
 ### Prerequisites
 
 - Grafana >=7.0
-- NodeJS >=14
+- [LTS](https://nodejs.dev/en/about/releases/) version of Node.js
 - yarn
   {{% /class %}}
 

docs/sources/developers/plugins/create-a-grafana-plugin/develop-a-plugin/build-an-app-plugin.md

@@ -22,7 +22,7 @@ Data source and panel plugins will show up like normal plugins. The app pages wi
 ### Prerequisites
 
 - Grafana 7.0
-- NodeJS 12.x
+- [LTS](https://nodejs.dev/en/about/releases/) version of Node.js
 - yarn
   {{% /class %}}