Bump Badger to v1.6.2

[Ackar]

Which problem is this PR solving?

• Solves Badger not cleaning data in expected manner #1916

Short description of the changes

• Bump Badger to v1.6.2

[codecov]

Codecov Report

Merging #2613 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2613      +/-   ##
==========================================
- Coverage   95.07%   95.05%   -0.03%     
==========================================
  Files         209      209              
  Lines        9364     9364              
==========================================
- Hits         8903     8901       -2     
- Misses        385      386       +1     
- Partials       76       77       +1     

Impacted Files	Coverage Δ
plugin/storage/badger/factory.go	95.78% <100.00%> (ø)
plugin/storage/badger/spanstore/reader.go	95.37% <100.00%> (ø)
cmd/query/app/server.go	88.52% <0.00%> (-1.64%)	⬇️

---

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 2a0d8cc...7d68d8b. Read the comment docs.

[yurishkuro]

lgtm, but maybe @burmanm can take a look?

[objectiser]

LGTM also, but will wait to see if @burmanm has any comment.

[burmanm]

Should solve some issues, yes.