Update agent version to 1.0.4 on agent_metadata.py

This is part of the procedure to release a new version of the agent onto PyPI

Description of changes:
Update agent version on agent_metadata.py as part of the preparation to release new version onto PyPI

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Author: gimki

codeguru_profiler_agent/agent_metadata/agent_metadata.py

@@ -9,7 +9,7 @@
 # NOTE: Please do not alter the value for the following constants without the full knowledge of the use of them.
 # These constants are used in several scripts, including setup.py.
 __agent_name__ = "CodeGuruProfiler-python"
-__agent_version__ = "1.0.3"
+__agent_version__ = "1.0.4"
 
 
 def look_up_fleet_info(