Update dependencies

[JKRhb]

This PR reactivates all tests (all except one have mistakenly been disabled), updates all dependencies, and cleans up/updates some code that used deprecated definitions.

[coveralls]

Pull Request Test Coverage Report for Build 3535426678

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 482 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-13.5%) to 47.555%

---

Files with Coverage Reduction	New Missed Lines	%
lib/retry_send.ts	2	85.19%
lib/outgoing_message.ts	11	60.58%
index.ts	13	50.46%
lib/cache.ts	24	59.09%
lib/option_converter.ts	38	58.13%
lib/helpers.ts	73	40.69%
lib/server.ts	94	54.21%
lib/agent.ts	227	17.32%

Totals
Change from base Build 3345980936:	-13.5%
Covered Lines:	1470
Relevant Lines:	3062

---

💛 - Coveralls

[JKRhb]

Hmm. Very weird, a couple of jobs are failing for some reason :/

[JKRhb]

Factored out the problematic cases into #360 and #361, so this one could also be merged now :)