minor #19286 [Setup] Remove @dev for 7.0 version (louismariegaborit)

This PR was merged into the 7.0 branch.

Discussion
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[Setup] Remove `@dev` for 7.0 version

Remove `@dev` since 7.0 is released.

Commits
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457d5e5 Remove `@dev`

Author: xabbuh

setup.rst

@@ -46,10 +46,10 @@ application:
 .. code-block:: terminal
 
     # run this if you are building a traditional web application
-    $ symfony new my_project_directory --version="7.0.*@dev" --webapp
+    $ symfony new my_project_directory --version="7.0.*" --webapp
 
     # run this if you are building a microservice, console application or API
-    $ symfony new my_project_directory --version="7.0.*@dev"
+    $ symfony new my_project_directory --version="7.0.*"
 
 The only difference between these two commands is the number of packages
 installed by default. The ``--webapp`` option installs all the packages that you
@@ -61,12 +61,12 @@ Symfony application using Composer:
 .. code-block:: terminal
 
     # run this if you are building a traditional web application
-    $ composer create-project symfony/skeleton:"7.0.*@dev" my_project_directory
+    $ composer create-project symfony/skeleton:"7.0.*" my_project_directory
     $ cd my_project_directory
     $ composer require webapp
 
     # run this if you are building a microservice, console application or API
-    $ composer create-project symfony/skeleton:"7.0.*@dev" my_project_directory
+    $ composer create-project symfony/skeleton:"7.0.*" my_project_directory
 
 No matter which command you run to create the Symfony application. All of them
 will create a new ``my_project_directory/`` directory, download some dependencies