Update java/ql/lib/ext/java.nio.file.model.yml

Co-authored-by: Owen Mansel-Chan <62447351+owen-mc@users.noreply.github.com>

Author: MarkLee131

java/ql/lib/ext/java.nio.file.model.yml

@@ -18,7 +18,7 @@ extensions:
       - ["java.nio.file", "Files", False, "delete", "(Path)", "", "Argument[0]", "path-injection", "ai-manual"]
       - ["java.nio.file", "Files", False, "deleteIfExists", "(Path)", "", "Argument[0]", "path-injection", "ai-manual"]
       - ["java.nio.file", "Files", False, "getFileStore", "(Path)", "", "Argument[0]", "path-injection", "ai-manual"] # the FileStore class is unlikely to be used for later sanitization
-      - ["java.nio.file", "Files", False, "exists", "(Path,LinkOption[])", "", "Argument[0]", "path-injection", "manual"]
+      - ["java.nio.file", "Files", False, "exists", "(Path,LinkOption[])", "", "Argument[0]", "path-injection[read]", "manual"]
       - ["java.nio.file", "Files", False, "lines", "(Path,Charset)", "", "Argument[0]", "path-injection[read]", "ai-manual"]
       - ["java.nio.file", "Files", False, "lines", "(Path)", "", "Argument[0]", "path-injection[read]", "ai-manual"]
       - ["java.nio.file", "Files", False, "move", "", "", "Argument[1]", "path-injection", "manual"]