QL for QL: update toolchain

ql/Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 members = [
     "extractor",
     "buramu",

ql/rust-toolchain.toml

@@ -1,7 +0,0 @@
-# This file specifies the Rust version used to develop and test the QL
-# extractor. It is set to the lowest version of Rust we want to support.
-
-[toolchain]
-channel = "1.74"
-profile = "minimal"
-components = [ "rustfmt" ]