fix: tensorflow/lite/micro/examples/magic_wand/train/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-73513
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1020813
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1020816
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1050385
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1050394
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1296180
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1296326
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- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1296336
- https://snyk.io/vuln/SNYK-PYTHON-TENSORFLOW-1296339
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tensorflow/lite/micro/examples/magic_wand/train/requirements.txt

@@ -1,2 +1,2 @@
-numpy==1.16.2
-tensorflow==2.0.0-beta1
+numpy==1.16.3
+tensorflow==2.4.0-beta1