bump otel version to v0.20.1

[cw9]

The previous version: v0.20.0 contains a memory leak: open-telemetry/opentelemetry-go#1904 which is fixed in v1-RC1

[codecov]

Codecov Report

Merging #3625 (309c63b) into master (5b3027b) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #3625     +/-   ##
========================================
- Coverage    56.2%   56.1%   -0.1%     
========================================
  Files         551     551             
  Lines       62061   61872    -189     
========================================
- Hits        34903   34757    -146     
+ Misses      24013   23990     -23     
+ Partials     3145    3125     -20     

Flag	Coverage Δ
aggregator	57.2% <ø> (ø)
cluster	∅ <ø> (∅)
collector	58.4% <ø> (ø)
dbnode	60.6% <ø> (-0.1%)	⬇️
m3em	46.4% <ø> (ø)
metrics	19.8% <ø> (ø)
msg	74.4% <ø> (+<0.1%)	⬆️

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[robskillington]

LGTM