[package] libevent: name for find_package is wrong
upstream and vcpkg are using `Libevent`, here `libevent`

diff --git a/recipes/libevent/2.1.11/conanfile.py b/recipes/libevent/2.1.11/conanfile.py
index 33fea5dae..f7d04e0a7 100644
--- a/recipes/libevent/2.1.11/conanfile.py
+++ b/recipes/libevent/2.1.11/conanfile.py
@@ -92,6 +92,9 @@ class LibeventConan(ConanFile):
 
     def package_info(self):
         self.cpp_info.libs = tools.collect_libs(self)
+        self.cpp_info.names["cmake_find_package"] = "Libevent"
+        self.cpp_info.names["cmake_find_package_multi"] = "Libevent"
+
         if self.settings.os == "Linux":
             self.cpp_info.system_libs.extend(["rt"])
 
['recipes/libevent/2.1.11/conanfile.py']