fix changesets

This PR introduces a BREAKING CHANGE considering that the environment variable for the `NPM_TOKEN` secret is changed. Even though this is changed in the default case when the action itself writes the `.npmrc` file, this could break if the file is custom-written beforehand or if subsequent steps read from the environment variable directly.

.changeset/brave-buckets-double.md

@@ -0,0 +1,7 @@
+---
+"@changesets/action": major
+---
+
+use `NODE_AUTH_TOKEN` as the environment variable name for the `NPM_TOKEN` secret
+
+This matches the official GitHub `setup-node` action (documentation)[https://docs.github.com/en/actions/publishing-packages/publishing-nodejs-packages#publishing-packages-to-the-npm-registry].

.changeset/light-yaks-search.md

@@ -2,6 +2,6 @@
 "@changesets/action": patch
 ---
 
-match `NPM_TOKEN`'s environment variable name to official documentation
+write environment variable references to files instead of the values
 
-= use `NODE_AUTH_TOKEN` as the environment variable name, which matches the official GitHub `setup-node` action documentation.= when writing the `.npmrc` file, write the environment variable name reference, rather than the variable value.
+Within the `.npmrc` and `.netrc` files, write references to `NODE_AUTH_TOKEN` and `GITHUB_TOKEN` rather than the actual values.