fix: req.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-AIOHTTP-6091621
- https://snyk.io/vuln/SNYK-PYTHON-AIOHTTP-6091622
- https://snyk.io/vuln/SNYK-PYTHON-AIOHTTP-6209406
- https://snyk.io/vuln/SNYK-PYTHON-AIOHTTP-6209407
- https://snyk.io/vuln/SNYK-PYTHON-FONTTOOLS-6133203
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321964
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321966
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321970
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-5918878
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6043904
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6182918
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6219984
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6219986
- https://snyk.io/vuln/SNYK-PYTHON-SETUPTOOLS-3180412
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1315149
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3372984
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3372987
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3372990
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3372993
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3372996
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3372999
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373002
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373005
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373008
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373011
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373014
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373017
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373020
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373023
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373026
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373029
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373032
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373035
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373038
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-3373041
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-5291376
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177
- https://snyk.io/vuln/SNYK-PYTHON-WHEEL-3180413

req.txt

@@ -1,5 +1,12 @@
-tensorflow>2.0
+tensorflow>2.12.0rc1
 matplotlib
 slackclient
 python-dotenv
 psutil
+aiohttp>=3.9.2 # not directly required, pinned by Snyk to avoid a vulnerability
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.2.0 # not directly required, pinned by Snyk to avoid a vulnerability
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+werkzeug>=2.3.8 # not directly required, pinned by Snyk to avoid a vulnerability
+wheel>=0.38.0 # not directly required, pinned by Snyk to avoid a vulnerability