Update python EC2 canary tests to match with cw agent rpm latest version. (#134)

Update python EC2 canary tests to match with cw agent rpm latest
version.
Matching with Java EC2 canary change:
aws-observability/aws-application-signals-test-framework#28

An example of workflow test passed:

https://github.com/aws-observability/aws-otel-python-instrumentation/actions/runs/8527133186

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choice.

Author: zzhlogin

.github/workflows/appsignals-python-e2e-ec2-test.yml

@@ -45,7 +45,7 @@ jobs:
           ref: main
 
       - name: Set CW Agent RPM environment variable
-        run: echo GET_CW_AGENT_RPM_COMMAND="wget -O cw-agent.rpm https://amazoncloudwatch-agent-${{ inputs.aws-region }}.s3.${{ inputs.aws-region }}.amazonaws.com/amazon_linux/amd64/1.300031.0b313/amazon-cloudwatch-agent.rpm" >> $GITHUB_ENV
+        run: echo GET_CW_AGENT_RPM_COMMAND="wget -O cw-agent.rpm https://amazoncloudwatch-agent-${{ inputs.aws-region }}.s3.${{ inputs.aws-region }}.amazonaws.com/amazon_linux/amd64/latest/amazon-cloudwatch-agent.rpm" >> $GITHUB_ENV
 
       - name: Generate testing id
         run: echo TESTING_ID="${{ github.run_id }}-${{ github.run_number }}" >> $GITHUB_ENV