One word fix to remove duplicate wording "not not"

[IanLee1521]

One line change to string.

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Unit tests & system/integration tests are added/updated
• Any new/changed dependencies in package.json are pinned (e.g. "1.2.3", not "^1.2.3" for the specified version)
• package-lock.json has been regenerated by running npm install (if dependencies have changed)

[codecov]

Codecov Report

Merging #1432 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1432   +/-   ##
======================================
  Coverage      83%     83%           
======================================
  Files         336     336           
  Lines       14312   14312           
  Branches     2460    2460           
======================================
  Hits        11738   11738           
  Misses       2561    2561           
  Partials       13      13

Impacted Files	Coverage Δ
...pplication/diagnostics/checks/pythonInterpreter.ts	93% <ø> (ø)	⬆️

---

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 a12df5e...a562f55. Read the comment docs.