Bumping FPP to v2.3.1 (#3572)

Author: LeStarch

requirements.txt

@@ -20,19 +20,19 @@ fprime-fpl-convert-xml==1.0.3
 fprime-fpl-extract-xml==1.0.3
 fprime-fpl-layout==1.0.3
 fprime-fpl-write-pic==1.0.3
-fprime-fpp-check==2.3.1a1
-fprime-fpp-depend==2.3.1a1
-fprime-fpp-filenames==2.3.1a1
-fprime-fpp-format==2.3.1a1
-fprime-fpp-from-xml==2.3.1a1
-fprime-fpp-locate-defs==2.3.1a1
-fprime-fpp-locate-uses==2.3.1a1
-fprime-fpp-syntax==2.3.1a1
-fprime-fpp-to-cpp==2.3.1a1
-fprime-fpp-to-dict==2.3.1a1
-fprime-fpp-to-json==2.3.1a1
-fprime-fpp-to-xml==2.3.1a1
-fprime-fpp-to-layout==2.3.1a1
+fprime-fpp-check==2.3.1
+fprime-fpp-depend==2.3.1
+fprime-fpp-filenames==2.3.1
+fprime-fpp-format==2.3.1
+fprime-fpp-from-xml==2.3.1
+fprime-fpp-locate-defs==2.3.1
+fprime-fpp-locate-uses==2.3.1
+fprime-fpp-syntax==2.3.1
+fprime-fpp-to-cpp==2.3.1
+fprime-fpp-to-dict==2.3.1
+fprime-fpp-to-json==2.3.1
+fprime-fpp-to-xml==2.3.1
+fprime-fpp-to-layout==2.3.1
 fprime-gds==3.6.1
 fprime-tools==3.6.1
 fprime-visual==1.0.2