feat(dependency): Upgrade go version to 1.14

[RealHarshThakur]

Pull Request template

Why is this PR required? What issue does it fix?:
This PR upgrades to go version to 1.14

What this PR does?:
It makes the CI and the repo's go version consistent with each other.

Does this PR require any upgrade changes?:
Yes, go version is upgraded

If the changes in this PR are manually verified, list down the scenarios covered::
Manually built the binary locally

Any additional information for your reviewer? :
Should be merged after removing gox PR as the go.mod file doesn't contain gox as a dependency anymore.
#456

Checklist:

• Fixes #
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them:

[codecov-commenter]

Codecov Report

Merging #459 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #459   +/-   ##
=======================================
  Coverage   44.74%   44.74%           
=======================================
  Files          64       64           
  Lines        2990     2990           
=======================================
  Hits         1338     1338           
  Misses       1548     1548           
  Partials      104      104           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f964fc0...52ff463. Read the comment docs.

[akhilerm]

question: have some questions on the modules.txt

[akhilerm]

@harshthakur9030 Can you also add a changelog for this version upgrade?

[akhilerm]

/lgtm