release build_web_compilers 4.1.0-beta.1 (#3756)

Author: jakemac53

build_web_compilers/CHANGELOG.md

@@ -1,6 +1,7 @@
-## 4.1.0-wip
+## 4.1.0-beta.1
 
 - Fix loading compiled modules from subdirectories.
+- Stop using deprecated wasm loader functions.
 
 ## 4.1.0-beta.0
 

build_web_compilers/pubspec.yaml

@@ -1,5 +1,5 @@
 name: build_web_compilers
-version: 4.1.0-wip
+version: 4.1.0-beta.1
 description: Builder implementations wrapping the dart2js and DDC compilers.
 repository: https://github.com/dart-lang/build/tree/master/build_web_compilers
 # This package can't be part of the workspace because it requires a very recent