Use ✅ instead of ✔️ in build scan reports

✔️ really doesn't look good in GitHub's dark theme.

Author: yrodiere

src/main/java/org/hibernate/infra/bot/ExtractDevelocityBuildScans.java

@@ -257,7 +257,7 @@ private String formatBuildScanList(List<DevelocityCIBuildScan> buildScans) {
 
 	private String statusToEmoji(DevelocityCIBuildScan.Status status) {
 		return switch ( status ) {
-			case SUCCESS -> ":heavy_check_mark:";
+			case SUCCESS -> ":white_check_mark:";
 			case FAILURE -> ":x:";
 		};
 	}