build: set Finschia/ostracon version

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Description

Extract the version of Finschia/ostracon from go.mod and set the flag on the build.

Motivation and context

Finschia/ostracon does not set its version even in the release branches, while the upstream tendermint sets its version. Hence, we won't apply this patch on the main, which uses tendermint already.

How has this been tested?

1. make build
2. ./build/simd ostracon version

Screenshots (if appropriate):

Checklist:

• [x] I followed the contributing guidelines and code of conduct.
• [x] I have added a relevant changelog to CHANGELOG.md
• [ ] I have added tests to cover my changes.
• [ ] I have updated the documentation accordingly.
• [ ] I have updated API documentation client/docs/swagger-ui/swagger.yaml