Update the Python minimum to 3.8 for Iron and Jazzy. (#404)

Because of various issues, we are stuck on Python 3.8
for both Iron and Jazzy.  Update REP-2000 to reflect this
fact.

Signed-off-by: Chris Lalancette <[email protected]>

Author: clalancette

rep-2000.rst

@@ -1001,7 +1001,7 @@ For example a Tier 1 middleware implementation on a Tier 2 platform can only rec
 Minimum language requirements:
 
 - C++17
-- Python 3.10
+- Python 3.8
 
 
 Dependency Requirements:
@@ -1117,7 +1117,7 @@ For example a Tier 1 middleware implementation on a Tier 2 platform can only rec
 Minimum language requirements:
 
 - C++17
-- Python 3.9
+- Python 3.8
 
 
 Dependency Requirements: