Update CI tests to correctly check when Echidna tests are passing

Author: gustavo-grieco

.github/workflows/echidna.yml

@@ -115,15 +115,15 @@ jobs:
             config: Popsicle.yaml
             contract: PopsicleFixed
             outcome: success
-            expected: 'totalBalanceAfterTransferIsPreserved(address,uint256):\s*passed'
+            expected: 'totalBalanceAfterTransferIsPreserved(address,uint256):\s*passing'
           - name: TestDepositWithPermit
             workdir: program-analysis/echidna/example/
             files: TestDepositWithPermit.sol
             solc-version: 0.8.0
             config: testdeposit.yaml
             contract: TestDepositWithPermit
             outcome: success
-            expected: 'testERC20PermitDeposit(uint256):\s*passed'
+            expected: 'testERC20PermitDeposit(uint256):\s*passing'
           - name: MultiABI
             workdir: program-analysis/echidna/example/
             files: multiabi.sol