Updated SDK beta versions in docs (#732)

- updated beta versions of code interpreter, core and desktop SDKs in
the install guide

Author: mishushakov

apps/web/src/app/(docs)/docs/sandbox/installing-beta-sdks/page.mdx

@@ -10,7 +10,7 @@ npm i @e2b/code-interpreter@beta
 ```
 
 ```bash {{ language: 'python' }}
-pip install e2b-code-interpreter==1.2.0b4
+pip install e2b-code-interpreter==1.2.0b5
 ```
 </CodeGroup>
 
@@ -22,7 +22,7 @@ npm i e2b@beta
 ```
 
 ```bash {{ language: 'python' }}
-pip install e2b==1.2.0b4
+pip install e2b==1.2.0b6
 ```
 </CodeGroup>
 
@@ -34,6 +34,6 @@ npm i @e2b/desktop@beta
 ```
 
 ```bash {{ language: 'python' }}
-pip install e2b-desktop==1.2.0b1
+pip install e2b-desktop==1.7.1b1
 ```
 </CodeGroup>