Update CI nightly version and disable a clippy warning

[adamhass]

Please make sure these boxes are checked, before submitting a new PR.

• [x] You ran rustfmt on the code base before submitting (on latest nightly with rustfmt support)
• [x] You reference which issue is being closed in the PR text (if applicable)

Other Changes

Disabling a clippy warning where we know we're breaking the rules.

[codecov[bot]]

Codecov Report

Merging #169 (f9337a4) into master (e6c33c2) will increase coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   70.55%   70.67%   +0.11%     
==========================================
  Files         100      100              
  Lines       19646    19600      -46     
==========================================
- Hits        13862    13852      -10     
+ Misses       5784     5748      -36     

Impacted Files	Coverage Δ
core/src/timer/timer_manager.rs	81.03% <ø> (-6.90%)	:arrow_down:
...eature-tests/protobuf-test/src/messages/example.rs	0.00% <ø> (ø)
core/src/timer/mod.rs	52.94% <0.00%> (-2.95%)	:arrow_down:
core/src/runtime/mod.rs	34.37% <0.00%> (-1.57%)	:arrow_down:
core/src/component/context.rs	90.16% <0.00%> (-0.55%)	:arrow_down:
core/src/actors/refs.rs	52.56% <0.00%> (-0.49%)	:arrow_down:
core/src/routing/mod.rs	97.18% <0.00%> (-0.47%)	:arrow_down:
core/src/ports.rs	64.47% <0.00%> (-0.33%)	:arrow_down:
docs/examples/src/bin/dns_resolver.rs	0.00% <0.00%> (ø)
... and 19 more

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