Update tendermint to v0.2.28 (#325)

## Describe your changes and provide context
- updates tendermint to v0.2.28

## Testing performed to validate your change
- regression check via tests

go.mod

@@ -146,7 +146,7 @@ replace (
 	github.com/gin-gonic/gin => github.com/gin-gonic/gin v1.7.0
 	github.com/gogo/protobuf => github.com/regen-network/protobuf v1.3.3-alpha.regen.1
 
-	github.com/tendermint/tendermint => github.com/sei-protocol/sei-tendermint v0.2.25
+	github.com/tendermint/tendermint => github.com/sei-protocol/sei-tendermint v0.2.28
 
 	// latest grpc doesn't work with with our modified proto compiler, so we need to enforce
 	// the following version across all dependencies.

go.sum

@@ -689,8 +689,8 @@ github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg
 github.com/segmentio/fasthash v1.0.3/go.mod h1:waKX8l2N8yckOgmSsXJi7x1ZfdKZ4x7KRMzBtS3oedY=
 github.com/sei-protocol/sei-iavl v0.1.7 h1:cUdHDBkxs0FF/kOt1qCVLm0K+Bqaw92/dbZSgn4kxiA=
 github.com/sei-protocol/sei-iavl v0.1.7/go.mod h1:7PfkEVT5dcoQE+s/9KWdoXJ8VVVP1QpYYPLdxlkSXFk=
-github.com/sei-protocol/sei-tendermint v0.2.25 h1:zxISpSYd4DPVMPpxhcHc+HYw0qlT8smzMwsV/2UvhhQ=
-github.com/sei-protocol/sei-tendermint v0.2.25/go.mod h1:+BtDvAwTkE64BlxzpH9ZP7S6vUYT9wRXiZa/WW8/o4g=
+github.com/sei-protocol/sei-tendermint v0.2.28 h1:5PB1a/zu6H2iDbxIMnXgDtB4QwV5PZRikguX8gASLGI=
+github.com/sei-protocol/sei-tendermint v0.2.28/go.mod h1:+BtDvAwTkE64BlxzpH9ZP7S6vUYT9wRXiZa/WW8/o4g=
 github.com/sei-protocol/sei-tm-db v0.0.5 h1:3WONKdSXEqdZZeLuWYfK5hP37TJpfaUa13vAyAlvaQY=
 github.com/sei-protocol/sei-tm-db v0.0.5/go.mod h1:Cpa6rGyczgthq7/0pI31jys2Fw0Nfrc+/jKdP1prVqY=
 github.com/shirou/gopsutil v2.20.5+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=