Auto merge of rust-lang#10888 - Alexendoo:cargo-sparse-registry-env, r=flip1995

Remove `CARGO_UNSTABLE_SPARSE_REGISTRY` env from ci

changelog: none

Sparse registry is the default so we don't need these anymore

Author: bors

.github/workflows/clippy.yml

@@ -25,7 +25,6 @@ env:
   CARGO_TARGET_DIR: '${{ github.workspace }}/target'
   NO_FMT_TEST: 1
   CARGO_INCREMENTAL: 0
-  CARGO_UNSTABLE_SPARSE_REGISTRY: true
 
 jobs:
   base:

.github/workflows/clippy_bors.yml

@@ -11,7 +11,6 @@ env:
   CARGO_TARGET_DIR: '${{ github.workspace }}/target'
   NO_FMT_TEST: 1
   CARGO_INCREMENTAL: 0
-  CARGO_UNSTABLE_SPARSE_REGISTRY: true
 
 defaults:
   run:

.github/workflows/clippy_dev.yml

@@ -16,7 +16,6 @@ on:
 env:
   RUST_BACKTRACE: 1
   CARGO_INCREMENTAL: 0
-  CARGO_UNSTABLE_SPARSE_REGISTRY: true
 
 jobs:
   clippy_dev: