Update CHANGELOG.md

It seems `4.5.1` has been released with the content of `unreleased`.
rails · Apr 18, 2023 · f34a439 · f34a439
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commit f34a439
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## unreleased
 
+## 4.5.1
+
 - update jquery to 3.6.1
 - update jquery-usj to 1.2.3