Fix building for Cloudflare Nitro preset (#1726)

It seems that Rollup node-resolve module doesn't properly deal with
trailing slashes, causing it to thing that `string_decoder` is a
built-in Node.js dependency and attempt to import it from `unenv`, which
will obviously fail, because `string_decoder` is not, in fact, a Node.js
dependency, but an individual dependency of `readable-stream`.

This adds a small patch for `readable-stream@2.3.8` dependency, which
removes the leading slash, which seems to fix the builds.

This probably should be reported to relevant developers (Rollup
node-resolve plugin or Nitro?).

package.json

@@ -57,7 +57,8 @@
   "packageManager": "pnpm@9.3.0",
   "pnpm": {
     "patchedDependencies": {
-      "markdown-it@13.0.1": "patches/markdown-it@13.0.1.patch"
+      "markdown-it@13.0.1": "patches/markdown-it@13.0.1.patch",
+      "readable-stream@2.3.8": "patches/readable-stream@2.3.8.patch"
     }
   }
 }

patches/readable-stream@2.3.8.patch

@@ -0,0 +1,22 @@
+diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
+index 3af95cb2dbf1e9fa93d261b030b0b090df507ff7..376e6979c13264d80d96e045ddbba5258d219373 100644
+--- a/lib/_stream_readable.js
++++ b/lib/_stream_readable.js
+@@ -169,7 +169,7 @@ function ReadableState(options, stream) {
+   this.decoder = null;
+   this.encoding = null;
+   if (options.encoding) {
+-    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
++    if (!StringDecoder) StringDecoder = require('string_decoder').StringDecoder;
+     this.decoder = new StringDecoder(options.encoding);
+     this.encoding = options.encoding;
+   }
+@@ -325,7 +325,7 @@ Readable.prototype.isPaused = function () {
+
+ // backwards compatibility.
+ Readable.prototype.setEncoding = function (enc) {
+-  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
++  if (!StringDecoder) StringDecoder = require('string_decoder').StringDecoder;
+   this._readableState.decoder = new StringDecoder(enc);
+   this._readableState.encoding = enc;
+   return this;