ci: set cache key to include rustc_hash

[ErikBjare]

Fixes #180

[codecov]

Codecov Report

Merging #193 (c8f2c21) into master (65e28bf) will increase coverage by 1.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #193      +/-   ##
==========================================
+ Coverage   59.67%   60.89%   +1.21%     
==========================================
  Files          42       43       +1     
  Lines        4308     4680     +372     
==========================================
+ Hits         2571     2850     +279     
- Misses       1737     1830      +93     

Impacted Files	Coverage Δ
aw-models/src/key_value.rs	15.38% <0.00%> (-84.62%)	⬇️
aw-transform/src/filter_keyvals.rs	77.27% <0.00%> (-9.10%)	⬇️
aw-models/src/duration.rs	43.04% <0.00%> (-4.13%)	⬇️
aw-transform/src/find_bucket.rs	80.00% <0.00%> (-3.34%)	⬇️
aw-query/src/parser.rs	35.46% <0.00%> (-3.29%)	⬇️
aw-query/src/lexer.rs	95.52% <0.00%> (-2.82%)	⬇️
aw-query/src/datatype.rs	71.88% <0.00%> (-0.62%)	⬇️
aw-transform/src/chunk.rs	91.66% <0.00%> (-0.34%)	⬇️
aw-server/src/dirs.rs	0.00% <0.00%> (ø)
aw-server/src/main.rs	0.00% <0.00%> (ø)
... and 30 more

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[ErikBjare]

Weird that there is a codecov diff here, maybe #189 isn't fixed after all?