build(deps): Bump github.com/confio/ics23/go from 0.6.3 to 0.6.6 (#6374)

Bumps [github.com/confio/ics23/go](https://github.com/confio/ics23) from 0.6.3 to 0.6.6.
<details>
<summary>Commits</summary>
<ul>
<li><a href="53a3a58ab8"><code>53a3a58</code></a> Revert go mod</li>
<li><a href="b66f10fc78"><code>b66f10f</code></a> Bump to 0.6.5</li>
<li><a href="19f273dffb"><code>19f273d</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/confio/ics23/issues/40">#40</a> from confio/cleanup</li>
<li><a href="46f21260db"><code>46f2126</code></a> Clippy and cleanup in tests</li>
<li><a href="667ddb335e"><code>667ddb3</code></a> Fix clippy warnings</li>
<li><a href="ea8b91d186"><code>ea8b91d</code></a> cargo fmt</li>
<li><a href="267cfba090"><code>267cfba</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/confio/ics23/issues/39">#39</a> from kostko/kostko/feature/more-ops</li>
<li><a href="346d8d9b19"><code>346d8d9</code></a> Implement FIXED32_LITTLE length operation</li>
<li><a href="61321db422"><code>61321db</code></a> Add SHA-512/256 hash operation</li>
<li><a href="77277ad2f8"><code>77277ad</code></a> Bump Rust to 0.6.4</li>
<li>Additional commits viewable in <a href="https://github.com/confio/ics23/compare/v0.6.3...go/v0.6.6">compare view</a></li>
</ul>
</details>
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</details>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/Workiva/go-datastructures v1.0.53
 	github.com/btcsuite/btcd v0.21.0-beta
 	github.com/btcsuite/btcutil v1.0.2
-	github.com/confio/ics23/go v0.6.3
+	github.com/confio/ics23/go v0.6.6
 	github.com/cosmos/iavl v0.15.3
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/go-kit/kit v0.10.0

go.sum

@@ -83,8 +83,9 @@ github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnht
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/confio/ics23/go v0.0.0-20200817220745-f173e6211efb/go.mod h1:E45NqnlpxGnpfTWL/xauN7MRwEE28T4Dd4uraToOaKg=
-github.com/confio/ics23/go v0.6.3 h1:PuGK2V1NJWZ8sSkNDq91jgT/cahFEW9RGp4Y5jxulf0=
 github.com/confio/ics23/go v0.6.3/go.mod h1:E45NqnlpxGnpfTWL/xauN7MRwEE28T4Dd4uraToOaKg=
+github.com/confio/ics23/go v0.6.6 h1:pkOy18YxxJ/r0XFDCnrl4Bjv6h4LkBSpLS6F38mrKL8=
+github.com/confio/ics23/go v0.6.6/go.mod h1:E45NqnlpxGnpfTWL/xauN7MRwEE28T4Dd4uraToOaKg=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=