Bumps the MSRV of blas testing crates to 1.67

This is unfortunately out of our control: users can select their blas implementations, and those implementations may not be MSRV 1.64, like ndarray itself. So we should add some documentation that makes this clear (or bump our MSRV). For now, we'll just add a gate in our test driver to handle this case

crates/blas-tests/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 authors = ["bluss"]
 publish = false
 edition = "2018"
+rust-version = "1.67"
 
 [lib]
 test = false

crates/numeric-tests/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 authors = ["bluss"]
 publish = false
 edition = "2018"
+rust-version = "1.67"
 
 [lib]
 test = false

scripts/all-tests.sh

@@ -21,8 +21,10 @@ cargo test -v -p ndarray -p ndarray-rand --release --features "$FEATURES" $QC_FE
 # BLAS tests
 cargo test -p ndarray --lib -v --features blas
 cargo test -p blas-mock-tests -v
-cargo test -p blas-tests -v --features blas-tests/openblas-system
-cargo test -p numeric-tests -v --features numeric-tests/test_blas
+if [[ "$CHANNEL" != "1.64.0" ]]; then # Fix openblas-build requiring MSRV 1.67
+    cargo test -p blas-tests -v --features blas-tests/openblas-system
+    cargo test -p numeric-tests -v --features numeric-tests/test_blas
+fi
 
 # Examples
 cargo test --examples