Increase http client timeout to 60s

[ruben1]

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have checked for similar issues and haven't found anything relevant.
• This is not a security issue (which should be reported here: https://circleci.com/security/)
• I have read Contribution Guidelines.

Changes

• Increase http client timeout to 60s

Rationale

Should help with timeouts that have been seen in /api/v2/context/* 95th/max requests causing job flakiness for some users

Here are some helpful tips you can follow when submitting a pull request:

1. Fork the repository and create your branch from master.
2. Run make build in the repository root.
3. If you've fixed a bug or added code that should be tested, add tests!
4. Ensure the test suite passes (make test).
5. The --debug flag is often helpful for debugging HTTP client requests and responses.
6. Format your code with gofmt.
7. Make sure your code lints (make lint). Note: This requires Docker to run inside a local job.

[codecov]

Codecov Report

Merging #733 (bf986a0) into master (e96ff59) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #733   +/-   ##
=======================================
  Coverage   28.50%   28.50%           
=======================================
  Files          42       42           
  Lines        4925     4925           
=======================================
  Hits         1404     1404           
  Misses       3323     3323           
  Partials      198      198           

Impacted Files	Coverage Δ
settings/settings.go	31.03% <100.00%> (ø)

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