Fix release script distribution check

Update `BintrayService.isDistributionComplete` to use unpublished
artifacts.

Author: philwebb

ci/images/releasescripts/src/main/java/io/spring/concourse/releasescripts/bintray/BintrayService.java

@@ -97,7 +97,7 @@ public boolean isDistributionComplete(ReleaseInfo releaseInfo, Set<String> requi
 	public boolean isDistributionComplete(ReleaseInfo releaseInfo, Set<String> requiredDigests, Duration timeout,
 			Duration pollInterval) {
 		logger.debug("Checking if distribution is complete");
-		RequestEntity<Void> request = getPackageFilesRequest(releaseInfo, 0);
+		RequestEntity<Void> request = getPackageFilesRequest(releaseInfo, 1);
 		try {
 			waitAtMost(timeout).with().pollDelay(Duration.ZERO).pollInterval(pollInterval).until(() -> {
 				logger.debug("Checking Bintray");

ci/images/releasescripts/src/test/java/io/spring/concourse/releasescripts/bintray/BintrayServiceTests.java

@@ -77,9 +77,9 @@ void tearDown() {
 
 	@Test
 	void isDistributionComplete() throws Exception {
-		setupGetPackageFiles(0, "no-package-files.json");
-		setupGetPackageFiles(0, "some-package-files.json");
-		setupGetPackageFiles(0, "all-package-files.json");
+		setupGetPackageFiles(1, "no-package-files.json");
+		setupGetPackageFiles(1, "some-package-files.json");
+		setupGetPackageFiles(1, "all-package-files.json");
 		Set<String> digests = new LinkedHashSet<>();
 		digests.add("602e20176706d3cc7535f01ffdbe91b270ae5012");
 		digests.add("602e20176706d3cc7535f01ffdbe91b270ae5013");