fix(instrumentation-ioredis): make @types/ioredis a devDependency

[pichlermarc]

Which problem is this PR solving?

• @types/ioredis is listed as a dependency even though it's types are not part of the `@opentelemetry/instrumentation-ioredis package's public API

Short description of the changes

• move @types/ioredis to devDependencies to avoid it being installed for consumers of the package.

Testing

Tested locally by running npm pack and then installing the package into a local package with typescript and without @types/ioredis installed. Imported and instantiated the instrumentation to check that everything still compiles correctly.

Fixes #2059

[codecov]

Codecov Report

Merging #2069 (be847fd) into main (dfb2dff) will decrease coverage by 0.16%.
Report is 46 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2069      +/-   ##
==========================================
- Coverage   90.97%   90.82%   -0.16%     
==========================================
  Files         146      148       +2     
  Lines        7492     7672     +180     
  Branches     1502     1537      +35     
==========================================
+ Hits         6816     6968     +152     
- Misses        676      704      +28     

see 8 files with indirect coverage changes

[trentm]

^^ @pichlermarc I enabled, and then disabled auto-merge. This is the first time I tried auto-merge on a PR from a repo that doesn't allow commits to the feature branch from the PR, so I cannot update with the base branch.

[pichlermarc]

@trentm this must've happened as I'm using an organization fork and did not have maintainer edits enabled.

I run a script to enable edits on my PRs via the API as GitHub does not allow enabling maintainer edits via the UI.
I forgot to run the script for this PR (turned it on for all my PRs just now).