chore: bump version to v0.0.50

[bdchatham]

Release the genesis-overrides feature (PR #181) plus the other six commits that have accumulated since v0.0.49: trusted-header authn (#179), gov-software-upgrade handler (#177), gov-vote handler (#175), /tx?hash= discriminator hardening (#173), sign-tx foundation (#170), production keyring backend (#168).

The Releaser workflow (.github/workflows/uci-release-publish.yml) triggers on push to version.json and tags this commit as v0.0.50.

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[github-actions]

Suggested version: v0.0.50

Comparing to: v0.0.49 (diff)

Changes in go.mod file(s):

(empty)

gorelease says:

gorelease: preparing to load packages for github.com/sei-protocol/seictl: looking for missing dependencies: go: -d flag is deprecated. -d=true is a no-op
go: github.com/gogo/protobuf@v1.3.3: reading github.com/gogo/protobuf/go.mod at revision v1.3.3: unknown revision v1.3.3

gocompat says:

Your branch is up to date with 'origin/main'.

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It is going to be published when this PR is merged.
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