MLECO-3213: Downgrade requirment from Python3.8 to Python3.7

Update Vela to 3.4.0

Signed-off-by: Richard Burton <richard.burton@arm.com>
Change-Id: If203d29d6884219cd4947a5753a1fb8d8284f174
diff --git a/scripts/py/requirements.txt b/scripts/py/requirements.txt
index 7b4045c..966dc82 100644
--- a/scripts/py/requirements.txt
+++ b/scripts/py/requirements.txt
@@ -3,11 +3,11 @@
 llvmlite==0.38.0
 MarkupSafe==1.1.1
 numba==0.55.1
-numpy==1.19.2
+numpy==1.21.6
 Pillow==7.2.0
 pycparser==2.20
 resampy==0.2.2
-scipy==1.8.0
+scipy==1.7.3
 six==1.16.0
 SoundFile==0.10.3.post1
 cmake==3.22.4