test: update alfajores fork tests to incl. cGBP, cZAR, cAUD and cCAD (#592)

Author: nvtaveras

test/fork/ForkTests.t.sol

@@ -47,7 +47,7 @@ import { GoodDollarExpansionForkTest } from "./GoodDollar/ExpansionForkTest.sol"
 import { LockingUpgradeForkTest } from "./upgrades/LockingUpgradeForkTest.sol";
 import { GHSRenameForkTest } from "./GHSRenameForkTest.sol";
 
-contract Alfajores_ChainForkTest is ChainForkTest(ALFAJORES_ID, 1, uints(17)) {}
+contract Alfajores_ChainForkTest is ChainForkTest(ALFAJORES_ID, 1, uints(21)) {}
 
 contract Alfajores_P0E00_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 0) {}
 
@@ -83,6 +83,14 @@ contract Alfajores_P0E15_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 1
 
 contract Alfajores_P0E16_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 16) {}
 
+contract Alfajores_P0E17_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 17) {}
+
+contract Alfajores_P0E18_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 18) {}
+
+contract Alfajores_P0E19_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 19) {}
+
+contract Alfajores_P0E20_ExchangeForkTest is ExchangeForkTest(ALFAJORES_ID, 0, 20) {}
+
 contract Celo_ChainForkTest is ChainForkTest(CELO_ID, 1, uints(17)) {}
 
 contract Celo_P0E00_ExchangeForkTest is ExchangeForkTest(CELO_ID, 0, 0) {}