Revert "update nightly version for miri (#1189)"

[alamb]

Which issue does this PR close?

Closes #1198

Rationale for this change

Master CI checks seem to be broken

What changes are included in this PR?

This reverts commit 548c961.

Are there any user-facing changes?

No (this just controls what version of Rust is used in CI checks)

[codecov-commenter]

Codecov Report

Merging #1199 (4f615cb) into master (0cc0c05) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 4f615cb differs from pull request most recent head 1dfd04a. Consider uploading reports for the commit 1dfd04a to get more accurate results

@@           Coverage Diff           @@
##           master    #1199   +/-   ##
=======================================
  Coverage   82.67%   82.68%           
=======================================
  Files         175      175           
  Lines       51561    51561           
=======================================
+ Hits        42630    42632    +2     
+ Misses       8931     8929    -2     

Impacted Files	Coverage Δ
parquet_derive/src/parquet_field.rs	66.43% <0.00%> (+0.22%)	⬆️
arrow/src/datatypes/datatype.rs	66.80% <0.00%> (+0.42%)	⬆️

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[alamb]

🤔 this did not seem to solve the problem either. Will have to dig deeper maybe later today if no one beats me to it

[gangliao]

It still installs the latest nightly code: https://github.com/apache/arrow-rs/runs/4853953542?check_suite_focus=true#step:6:7

[gangliao]

11s
Run rustup toolchain install nightly
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'
info: latest update on 2022-01-18, rust version 1.60.0-nightly (ee5d8d37b 2022-01-17)
info: downloading component 'cargo'
info: downloading component 'rust-std'
info: downloading component 'rustc'
info: installing component 'cargo'
info: installing component 'rust-std'
info: installing component 'rustc'

  nightly-x86_64-unknown-linux-gnu installed - rustc 1.60.0-nightly (ee5d8d37b 2022-01-17)

info: checking for self-updates
info: using existing install for 'nightly-x86_64-unknown-linux-gnu'

info: default toolchain set to 'nightly-x86_64-unknown-linux-gnu'
  nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.60.0-nightly (ee5d8d37b 2022-01-17)

info: downloading component 'rustfmt'
info: installing component 'rustfmt'

[jimexist]

thanks for the change. in my opinion it was hardly the reason. either way just bumping a nightly version in CI wouldn't be the cause of a breakage (if it were, it were merely exposing a false negative).

i remember we had a good fight with miri some months ago. at the end @alamb you had to disable miri for a while...

[alamb]

Yeah I agree that the upgrade of nightly version doesn't seem to have caused this issue;
All the checks passed on #1189 -- https://github.com/apache/arrow-rs/pull/1189/checks

I suspect that this is related to some crate being released that was not actually 'semver' compatible in some way