Update requirements.txt for release v4.0.0a1 (#3623)

* Update requirements.txt for release v4.0.0a1

* put fprime-fpp-* packages back

Author: thomas-bc

requirements.txt

@@ -35,8 +35,8 @@ fprime-fpp-to-dict==3.0.0a10
 fprime-fpp-to-json==3.0.0a10
 fprime-fpp-to-xml==3.0.0a10
 fprime-fpp-to-layout==3.0.0a10
-fprime-gds==3.6.1
-fprime-tools==3.6.1
+fprime-gds==4.0.0a1
+fprime-tools==4.0.0a1
 fprime-visual==1.0.2
 gcovr==8.2
 idna==3.10