Update README to recommend that users install Python 3

[samsondav]

No description provided.

[github-actions]

I see that you haven't updated any CHANGELOG files. Would it make sense to do so?

[codecov]

Codecov Report

Merging #5619 (36b323c) into develop (bf041a1) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5619      +/-   ##
===========================================
+ Coverage    59.08%   59.09%   +0.01%     
===========================================
  Files          384      384              
  Lines        33487    33487              
===========================================
+ Hits         19785    19789       +4     
+ Misses       11682    11680       -2     
+ Partials      2020     2018       -2     

Impacted Files	Coverage Δ
core/services/ocrcommon/run_saver.go	79.31% <0.00%> (-6.90%)	⬇️
...rvices/synchronization/telemetry_ingress_client.go	58.10% <0.00%> (-2.71%)	⬇️
core/services/vrf/listener_v1.go	85.30% <0.00%> (-0.95%)	⬇️
core/services/fluxmonitorv2/flux_monitor.go	76.83% <0.00%> (+0.47%)	⬆️
core/services/keystore/keys/vrfkey/crypto.go	46.91% <0.00%> (+2.46%)	⬆️
core/services/health/health.go	64.28% <0.00%> (+5.95%)	⬆️

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