worker: graduate get/setEnvironmentData APIs

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #41272
Reviewed-By: Michaël Zasso <targos@protonmail.com>

Author: jasnell

doc/api/worker_threads.md

@@ -64,11 +64,15 @@ specifically `argv` and `execArgv` options.
 ## `worker.getEnvironmentData(key)`
 
 <!-- YAML
-added: v15.12.0
+added:
+  - v15.12.0
+  - v14.18.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/41272
+    description: No longer experimental.
 -->
 
-> Stability: 1 - Experimental
-
 * `key` {any} Any arbitrary, cloneable JavaScript value that can be used as a
   {Map} key.
 * Returns: {any}
@@ -290,11 +294,15 @@ new Worker('process.env.SET_IN_WORKER = "foo"', { eval: true, env: SHARE_ENV })
 ## `worker.setEnvironmentData(key[, value])`
 
 <!-- YAML
-added: v15.12.0
+added:
+  - v15.12.0
+  - v14.18.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/41272
+    description: No longer experimental.
 -->
 
-> Stability: 1 - Experimental
-
 * `key` {any} Any arbitrary, cloneable JavaScript value that can be used as a
   {Map} key.
 * `value` {any} Any arbitrary, cloneable JavaScript value that will be cloned