build(deps): Bump cosmossdk.io/api from 0.8.0 to 0.8.1 in /x/tx

Bumps [cosmossdk.io/api](https://github.com/cosmos/cosmos-sdk) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/cosmos/cosmos-sdk/releases)
- [Changelog](https://github.com/cosmos/cosmos-sdk/blob/main/CHANGELOG.md)
- [Commits](v0.8.0...0.8.1)

---
updated-dependencies:
- dependency-name: cosmossdk.io/api
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

x/tx/go.mod

@@ -3,7 +3,7 @@ module cosmossdk.io/x/tx
 go 1.23
 
 require (
-	cosmossdk.io/api v0.8.0
+	cosmossdk.io/api v0.8.1
 	cosmossdk.io/errors v1.0.1
 	cosmossdk.io/math v1.5.0
 	github.com/cosmos/cosmos-proto v1.0.0-beta.5

x/tx/go.sum

@@ -2,8 +2,8 @@ buf.build/gen/go/cometbft/cometbft/protocolbuffers/go v1.36.2-20241120201313-68e
 buf.build/gen/go/cometbft/cometbft/protocolbuffers/go v1.36.2-20241120201313-68e42a58b301.1/go.mod h1:UJ1nx2WHcWAvKiaem512kYlHektAZJ/eNU032Pdar70=
 buf.build/gen/go/cosmos/gogo-proto/protocolbuffers/go v1.36.2-20240130113600-88ef6483f90f.1 h1:LFgdGZ+BzNqHWsndyRvvFE1450BBZ2nFtyNEGZ9NOSg=
 buf.build/gen/go/cosmos/gogo-proto/protocolbuffers/go v1.36.2-20240130113600-88ef6483f90f.1/go.mod h1:cuOHNO5SRU1J25UoI8VvPyi8dq9BpZb4gKa01Umx57Y=
-cosmossdk.io/api v0.8.0 h1:E5Xifxu/3mPTLF79si9fyq4rR0wagubeVNmOz5duTUo=
-cosmossdk.io/api v0.8.0/go.mod h1:hgJ83P0ZUu0rS1SZoVM6abk6ADOkiM259BVVlYtAPP0=
+cosmossdk.io/api v0.8.1 h1:jQxx7CgUZDfgbPhPak41hW8TZzqfj06YxNI1WOulOo4=
+cosmossdk.io/api v0.8.1/go.mod h1:8Q+Je1bFwsNTCMe6qigVDDyrNmFYa7ttvG96tN/oKGw=
 cosmossdk.io/errors v1.0.1 h1:bzu+Kcr0kS/1DuPBtUFdWjzLqyUuCiyHjyJB6srBV/0=
 cosmossdk.io/errors v1.0.1/go.mod h1:MeelVSZThMi4bEakzhhhE/CKqVv3nOJDA25bIqRDu/U=
 cosmossdk.io/math v1.5.0 h1:sbOASxee9Zxdjd6OkzogvBZ25/hP929vdcYcBJQbkLc=