test(connector-fabric): upgrade Fabric AIO image tag used for test

Upgraded from the image build in March 2021 to the one in April which
is believed to be more stable making this change potentially viable as
a soltuion to the flakes that we've been observing during test execution
when the AIO image fails to boot.

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

packages/cactus-plugin-ledger-connector-fabric/src/test/typescript/integration/fabric-v2-2-x/run-transaction-endpoint-v1.test.ts

@@ -65,7 +65,7 @@ test(testCase, async (t: Test) => {
     publishAllPorts: true,
     logLevel,
     imageName: "hyperledger/cactus-fabric2-all-in-one",
-    imageVersion: "2021-03-08-hotfix-test-network",
+    imageVersion: "2021-04-20-nodejs",
     envVars: new Map([
       ["FABRIC_VERSION", "2.2.0"],
       ["CA_VERSION", "1.4.9"],