ci: Bump nightly Rust to 2022-01-11

[thanethomson]

Minor PR to update nightly Rust in CI.

[codecov-commenter]

Codecov Report

Merging #1085 (d90fffe) into master (38668f1) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #1085     +/-   ##
========================================
- Coverage    64.7%   64.6%   -0.1%     
========================================
  Files         238     239      +1     
  Lines       20592   20637     +45     
========================================
+ Hits        13332   13346     +14     
- Misses       7260    7291     +31     

Impacted Files	Coverage Δ
testgen/src/header.rs	83.9% <0.0%> (-0.6%)	⬇️
rpc/src/client/transport/mock.rs	88.1% <0.0%> (-0.1%)	⬇️
rpc/src/client.rs	5.1% <0.0%> (-0.1%)	⬇️
rpc/src/client/bin/main.rs	0.3% <0.0%> (-0.1%)	⬇️
rpc/src/client/transport/http.rs	0.0% <0.0%> (ø)
tools/rpc-probe/src/common.rs	0.0% <0.0%> (ø)
light-client/src/supervisor.rs	88.4% <0.0%> (+<0.1%)	⬆️
tendermint/src/node.rs	63.8% <0.0%> (+<0.1%)	⬆️
rpc/src/client/transport/websocket.rs	64.9% <0.0%> (+<0.1%)	⬆️
config/src/config.rs	55.1% <0.0%> (+<0.1%)	⬆️
... and 7 more

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