pin deps to python3.6 version

We are using python3.6 in testing setup
and some deps are not available beyond
certain version for python3.6

This might cause issue with python3.6 where
latest versions are not available

Signed-off-by: Harsh Modi <hmodi@redhat.com>

requirements.txt

@@ -5,8 +5,8 @@ requests
 requests-kerberos
 six
 PyYAML
-opentelemetry-api==1.19.0
-opentelemetry-exporter-otlp==1.19.0
-opentelemetry-instrumentation-requests==0.40b0
-opentelemetry-sdk==1.19.0
+opentelemetry-api==1.12.0
+opentelemetry-exporter-otlp==1.12.0
+opentelemetry-instrumentation-requests==0.33b0
+opentelemetry-sdk==1.12.0
 otel-extensions