Fixes conditional comparison in shell script

Author: akern40

scripts/all-tests.sh

@@ -21,12 +21,12 @@ cargo test -v -p ndarray -p ndarray-rand --release --features "$FEATURES" $QC_FE
 # BLAS tests
 cargo test -p ndarray --lib -v --features blas
 cargo test -p blas-mock-tests -v
-if [ "$CHANNEL" == "1.64.0" ]; then
+if [ "$CHANNEL" = "1.64.0" ]; then
     cargo test -p blas-tests -v --features blas-tests/blis-system
 else
     cargo test -p blas-tests -v --features blas-tests/openblas-system
 fi
-if [ "$CHANNEL" == "1.64.0" ]; then
+if [ "$CHANNEL" = "1.64.0" ]; then
     cargo test -p numeric-tests -v --features numeric-tests/test_blis
 else
     cargo test -p numeric-tests -v --features numeric-tests/test_blas