refactoring(config): remove unused code, reuse version pointer

[rustatian]

Reason for This PR

• Redundant memory allocations.

Description of Changes

• Reuse version pointer.
• Remove unused code.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #159 (d4c6178) into master (0f684db) will increase coverage by 0.03%. The diff coverage is 31.25%.

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage   67.35%   67.38%   +0.03%     
==========================================
  Files         135      134       -1     
  Lines       10497    10477      -20     
==========================================
- Hits         7070     7060      -10     
+ Misses       2685     2677       -8     
+ Partials      742      740       -2     

Impacted Files	Coverage Δ
grpc/config.go	36.90% <0.00%> (-0.75%)	:arrow_down:
config/plugin.go	62.32% <16.66%> (-0.87%)	:arrow_down:
config/versions.go	77.37% <80.00%> (+0.34%)	:arrow_up:
beanstalk/beanstalkjobs/item.go	73.97% <0.00%> (-2.74%)	:arrow_down:
tcp/plugin.go	71.92% <0.00%> (-0.88%)	:arrow_down:
tcp/handler/handler.go	57.43% <0.00%> (+6.08%)	:arrow_up:

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