[BugFix: Issue #351] Upgrade terraform plugin sdk to v2.16.0

[dikhan]

What problem does this Pull Request solve?

Upgrades the Terraform Plugin SDK version to v2.16.0

• This will also fix the issues with the unit tests failing due to the changes in the terraform releases service which caused breaking changes in underlying libraries like github.com/hashicorp/hc-install used indirectly by the sdk. This terraform sdk version ensures we use a version that has a hc-install version with the fix

Please link to the issue number here (issue will be closed when PR is merged): Closes #351

Type of change

What type of change does your code introduce to the provider? Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [ ] New feature (change that adds new functionality)
• [x] Bug-fix (change that fixes current functionality)
• [ ] Tech debt (enhances the current functionality)
• [ ] New release (pumps the version)

Checklist

Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] I have read and followed the CONTRIBUTING guidelines
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have made sure code compiles correctly and all tests are passing by running make test-all
• [x] I have added/updated necessary documentation (if appropriate)
• [x] I have added the following info to the title of the PR (pick the appropriate option for the type of change). This is important because the release notes will include this information.
  • [ ] Feature Request: PRs related to feature requests should have in the title [FeatureRequest: Issue #X] <PR Title>
  • [x] Bug Fixes: PRs related to bug fixes should have in the title [BugFix: Issue #X] <PR Title>
  • [ ] Tech Debt: PRs related to technical debt should have in the title [TechDebt: Issue #X] <PR Title>
  • [ ] New Release: PRs related to a new release should have in the title [NewRelease] vX.Y.Z

Checklist for Admins

• [x] Label is populated
• [x] PR is assigned to the corresponding project
• [ ] PR has at least 1 reviewer and 1 assignee

[codecov[bot]]

Codecov Report

Base: 93.66% // Head: 93.66% // No change to project coverage :thumbsup:

Coverage data is based on head (84b5e7b) compared to base (54e1be9). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #354 +/- ## ======================================= Coverage 93.66% 93.66% ======================================= Files 60 60 Lines 3584 3584 ======================================= Hits 3357 3357 Misses 160 160 Partials 67 67 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Daniel+I.+Khan+Ramiro). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Daniel+I.+Khan+Ramiro)

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