add missing changelog entry for bump of sdk 0.45.3 (#1272)

## Description

closes: #XXXX

---

Before we can merge this PR, please make sure that all the following items have been
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- [x] Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [ ] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/structure.md).
- [ ] Wrote unit and integration [tests](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#testing)
- [ ] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
- [ ] Added relevant `godoc` [comments](https://blog.golang.org/godoc-documenting-go-code).
- [x] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
- [x] Re-reviewed `Files changed` in the Github PR explorer
- [ ] Review `Codecov Report` in the comment section below once CI passes

(cherry picked from commit 23fccc5)

Author: crodriguezvega

CHANGELOG.md

@@ -38,6 +38,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Dependencies
 
+* [\#1247](https://github.com/cosmos/ibc-go/pull/1247) Bump SDK version to v0.45.3 and Tendermint to version 0.34.19
+
 ### API Breaking
 
 ### State Machine Breaking