Add missing CollectionUtils model

Author: smowton

java/ql/src/semmle/code/java/frameworks/spring/SpringUtil.qll

@@ -26,6 +26,7 @@ private class FlowSummaries extends SummaryModelCsv {
         "org.springframework.util;Base64Utils;false;encodeToUrlSafeString;;;Argument[0];ReturnValue;taint",
         "org.springframework.util;Base64Utils;false;encodeUrlSafe;;;Argument[0];ReturnValue;taint",
         "org.springframework.util;CollectionUtils;false;arrayToList;;;ArrayElement of Argument[0];Element of ReturnValue;value",
+        "org.springframework.util;CollectionUtils;false;findFirstMatch;;;Element of Argument[0];ReturnValue;value",
         "org.springframework.util;CollectionUtils;false;findValueOfType;;;Element of Argument[0];ReturnValue;value",
         "org.springframework.util;CollectionUtils;false;firstElement;;;Element of Argument[0];ReturnValue;value",
         "org.springframework.util;CollectionUtils;false;lastElement;;;Element of Argument[0];ReturnValue;value",

java/ql/test/library-tests/frameworks/spring/util/Test.java

@@ -198,6 +198,13 @@ public void test() throws Exception {
 			out = CollectionUtils.arrayToList(in);
 			sink(getElement(out)); // $hasValueFlow
 		}
+		{
+			// "org.springframework.util;CollectionUtils;false;findFirstMatch;;;Element of Argument[0];ReturnValue;value"
+			Object out = null;
+			Collection in = List.of(source());
+			out = CollectionUtils.findFirstMatch(in, null);
+			sink(out); // $hasValueFlow
+		}
 		{
 			// "org.springframework.util;CollectionUtils;false;findValueOfType;;;Element of Argument[0];ReturnValue;value"
 			Object out = null;