Add 0.53 summary to changelog.md

.changelog/v0.53.0/summary.md

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+<!--
+    Add a summary for the release here.
+
+    If you don't change this message, or if this file is empty, the release
+    will not be created. -->
+
+This release overhauls the `ibc-testkit` crate such that it is now able to:
+
+- simulate more realistic IBC workflows by utilizing real IBC and relayer interfaces (as opposed to mocked versions)
+- validate code paths that were not easily testable beforehand, such as Merkle proof generation
+- compose tests in a much more succinct and readable fashion
+
+Note that the drastic changes made to `ibc-testkit`'s structs and types are breaking changes.
+
+For more information and background context on the changes to `ibc-testkit` and the rationale
+behind the overhaul, please refer to [ADR 009][adr-009].
+
+This release also includes a fix to the proof verification logic for `PacketTimeout`s, which was verifying an incorrect field. It also bumps the minimum-supported version of `ibc-proto` to 0.44, and the version of `tendermint` to 0.36. Note that the minimum-supported Rust version was reverted back to
+1.71.1.
+
+[adr-009]: https://github.com/cosmos/ibc-rs/blob/main/docs/architecture/adr-009-revamp-testkit.md

CHANGELOG.md

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 # CHANGELOG
 
+## v0.53.0
+
+*May 13, 2024*
+
+This release overhauls the `ibc-testkit` crate such that it is now able to:
+
+- simulate more realistic IBC workflows by utilizing real IBC and relayer interfaces (as opposed to mocked versions)
+- validate code paths that were not easily testable beforehand, such as Merkle proof generation
+- compose tests in a much more succinct and readable fashion
+
+Note that the drastic changes made to `ibc-testkit`'s structs and types are breaking changes.
+
+For more information and background context on the changes to `ibc-testkit` and the rationale
+behind the overhaul, please refer to [ADR 009][adr-009].
+
+This release also includes a fix to the proof verification logic for `PacketTimeout`s, which was verifying an incorrect field. It also bumps the minimum-supported version of `ibc-proto` to 0.44, and the version of `tendermint` to 0.36. Note that the minimum-supported Rust version was reverted back to
+1.71.1.
+
+[adr-009]: https://github.com/cosmos/ibc-rs/blob/main/docs/architecture/adr-009-revamp-testkit.md
+
+### BUG FIXES
+
+- [ibc-core] Fix proof verification for `PacketTimeout` on a closed channel.
+  ([\#1217](https://github.com/cosmos/ibc-rs/issues/1217))
+
+### IMPROVEMENTS
+
+- [ibc-testkit] Replace `HostBlock` and `HostType` enums with a `Host` trait to
+  eliminate manual delegations by utilizing monomorphization.
+  ([\#1044](https://github.com/cosmos/ibc-rs/issues/1044))
+- Update `ibc-proto` to v0.44.0 and `tendermint` dependencies to v0.36.0.
+  ([\#1212](https://github.com/cosmos/ibc-rs/issues/1212))
+- Revert Rust minimum supported version to `1.71.1`.
+  ([\#1206](https://github.com/cosmos/ibc-rs/pull/1206))
+
 ## v0.52.0
 
 *April 26, 2024*