chore(tvix/clippy): configure clippy allow block_in_conditions

… in Cargo.toml.

This gets an imperative `cargo clippy` run to pick up that config,
so `-A clippy::blocks_in_conditions` doesn't need to be explicitly
specified anymore.

Change-Id: I32b6cc50c77c22cba0d816d0db508c2f94b2c383
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11659
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: edef <edef@edef.eu>
Tested-by: BuildkiteCI

tvix/Cargo.toml

@@ -30,6 +30,11 @@ members = [
   "store",
 ]
 
+[workspace.lints.clippy]
+# Allow blocks_in_conditions due to false positives with #[tracing::instrument(…)]:
+# https://github.com/rust-lang/rust-clippy/issues/12281
+blocks_in_conditions = "allow"
+
 # Add a profile to all targets that enables release optimisations, but
 # retains debug symbols. This is great for use with
 # benchmarking/profiling tools.