fix: requirements.txt to reduce vulnerabilities (#24)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-AIOHTTP-1584144
- https://snyk.io/vuln/SNYK-PYTHON-LXML-2316995
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321964
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321966
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321969
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321970

Author: snyk-bot

requirements.txt

@@ -1,4 +1,4 @@
-aiohttp==3.7.4
+aiohttp==3.8.0
 appdirs==1.4.3
 APScheduler==3.6.3
 astroid==2.3.3
@@ -25,12 +25,12 @@ idna-ssl==1.1.0
 isort==4.3.21
 kiwisolver==1.1.0
 lazy-object-proxy==1.4.3
-lxml==4.6.3
+lxml==4.6.5
 matplotlib==3.1.2
 mccabe==0.6.1
 mcstatus==2.3.0
 multidict==4.7.4
-numpy==1.18.1
+numpy==1.22.2
 pathspec==0.7.0
 psutil==5.6.7
 pyasn1==0.4.8