buffer: graduate Blob from experimental

It's time.

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

PR-URL: #41270
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>

doc/api/buffer.md

@@ -456,10 +456,12 @@ Additionally, the [`buf.values()`][], [`buf.keys()`][], and
 added:
   - v15.7.0
   - v14.18.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/00000
+    description: No longer experimental.
 -->
 
-> Stability: 1 - Experimental
-
 A [`Blob`][] encapsulates immutable, raw data that can be safely shared across
 multiple worker threads.
 

lib/internal/blob.js

@@ -44,7 +44,6 @@ const {
 const {
   createDeferredPromise,
   customInspectSymbol: kInspect,
-  emitExperimentalWarning,
 } = require('internal/util');
 const { inspect } = require('internal/util/inspect');
 
@@ -134,7 +133,6 @@ class Blob {
    * @constructs {Blob}
    */
   constructor(sources = [], options = {}) {
-    emitExperimentalWarning('buffer.Blob');
     if (sources === null ||
         typeof sources[SymbolIterator] !== 'function' ||
         typeof sources === 'string') {