Bump version to 2.20.9-SNAPSHOT

[JohnNiang]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR bumps version to 2.20.9-SNAPSHOT.

Does this PR introduce a user-facing change?

None

[guqing]

/lgtm

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.23%. Comparing base (eff73dc) to head (38b3e32).
Report is 48 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6982      +/-   ##
============================================
+ Coverage     56.99%   57.23%   +0.23%     
- Complexity     3999     4007       +8     
============================================
  Files           714      712       -2     
  Lines         24110    24144      +34     
  Branches       1585     1590       +5     
============================================
+ Hits          13742    13819      +77     
+ Misses         9756     9710      -46     
- Partials        612      615       +3     

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[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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