Update example projects' cabal files

Author: szg251

examples/plutus-game/cabal.project

@@ -1,5 +1,5 @@
 -- Bump this if you need newer packages
-index-state: 2021-10-20T00:00:00Z
+index-state: 2022-05-18T00:00:00Z
 
 packages:
   ./. 
@@ -12,3 +12,10 @@ write-ghc-environment-files: never
 tests: true
 benchmarks: true
 
+allow-newer:
+    *:aeson
+  , size-based:template-haskell
+
+constraints:
+    aeson >= 2
+  , hedgehog >= 1.1

examples/plutus-nft/cabal.project

@@ -1,5 +1,5 @@
 -- Bump this if you need newer packages
-index-state: 2021-10-20T00:00:00Z
+index-state: 2022-05-18T00:00:00Z
 
 packages:
   ./. 
@@ -12,3 +12,10 @@ write-ghc-environment-files: never
 tests: true
 benchmarks: true
 
+allow-newer:
+    *:aeson
+  , size-based:template-haskell
+
+constraints:
+    aeson >= 2
+  , hedgehog >= 1.1

examples/plutus-transfer/cabal.project

@@ -1,5 +1,5 @@
 -- Bump this if you need newer packages
-index-state: 2021-10-20T00:00:00Z
+index-state: 2022-05-18T00:00:00Z
 
 packages:
   ./. 
@@ -12,3 +12,10 @@ write-ghc-environment-files: never
 tests: true
 benchmarks: true
 
+allow-newer:
+    *:aeson
+  , size-based:template-haskell
+
+constraints:
+    aeson >= 2
+  , hedgehog >= 1.1