[haskell-http-client] bump deps to LTS 14.3

[jonschoning]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\. If contributing template-only or documentation-only changes which will change sample output, be sure to build the project first.
• Filed the PR against the correct branch: master, 4.1.x, 5.0.x. Default: master.
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Description of the PR

(details of the change, additional tests that have been done, reference to the issue for tracking, etc)

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[wing328]

I tested it locally in my Mac but got the following errors:

Downloading timestamp
Downloading snapshot
Downloading mirrors
Updating index
Updated package index downloaded
Update complete
Populating index cache ...
Populated index cache.
Unable to load cabal files for snapshot

----
Deleting cached snapshot file: /Users/williamcheng/.stack/build-plan/lts-14.3.yaml
Recommendation: try running again. If this fails again, open an upstream issue at:
https://github.com/fpco/lts-haskell/issues/new
----

Unable to parse cabal file for co-log-0.3.0.0@sha256:0eb5cf2598c3673f39a8e967a6a4f5043f4d1f1fcb50a844653c34fcf0cb068a,4508

- 0:0: Unsupported cabal-version. See https://github.com/haskell/cabal/issues/4899.

[jonschoning]

You might have to upgrade your version of stack , the build tool, to the latest version

[wing328]

@jonschoning upgrading stack fixes it

Finished in 0.0980 seconds
46 examples, 0 failures

openapi-petstore  > Test suite tests passed
Completed 16 action(s).
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 15:16 min
[INFO] Finished at: 2019-08-28T00:33:29+08:00
[INFO] ------------------------------------------------------------------------

[wing328]

@jonschoning thanks for the PR, which has been included in the v4.1.2 release: https://twitter.com/oas_generator/status/1172068944355528705