Workaround a clippy bug (#324)

* ineffective as a lasersight on a shotgun; but makes clippy work

* toolchain is mentioned in the cmd
15 jobs for master in 5 minutes (queued for 2 seconds)
Status Job ID Name Coverage
  Check
passed #394801
linux-docker
check-std

00:01:32

passed #394802
linux-docker
check-wasm

00:01:39

 
  Workspace
passed #394803
linux-docker
build-std

00:01:58

passed #394804
linux-docker
build-wasm

00:02:23

failed #394806
linux-docker
clippy-std

00:00:14

failed #394807
linux-docker
clippy-wasm

00:00:14

passed #394808
linux-docker
fmt

00:00:16

failed #394805
linux-docker
test

00:03:24

 
  Examples
skipped #394811
linux-docker
examples-clippy-std
skipped #394812
linux-docker
examples-clippy-wasm
skipped #394813
linux-docker
examples-contract-build
skipped #394810
linux-docker
examples-fmt
skipped #394814
linux-docker
examples-generate-metadata
skipped #394809
linux-docker
examples-test
 
  Publish
skipped #394815
linux-docker
publish-docs
 
Name Stage Failure
failed
test Workspace


failures:
compile_tests

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out

error: test failed, to rerun pass '--test compile_tests'
ERROR: Job failed: exit code 1
failed
clippy-wasm Workspace
Caused by:
Unable to update registry `https://github.com/rust-lang/crates.io-index`

Caused by:
failed to fetch `https://github.com/rust-lang/crates.io-index`

Caused by:
missing delta bases; class=Indexer (15)
ERROR: Job failed: exit code 1
failed
clippy-std Workspace
Caused by:
Unable to update registry `https://github.com/rust-lang/crates.io-index`

Caused by:
failed to fetch `https://github.com/rust-lang/crates.io-index`

Caused by:
missing delta bases; class=Indexer (15)
ERROR: Job failed: exit code 1