[2.0.0] Bump to 2.0.0-rc4

[sssoleileraaa]

Status

Ready for review

Description of Changes

Towards #5969

Bumps release version to rc4

Testing

• version updated correctly
• changelog accurate
• base of PR is release/2.0.0

[codecov-commenter]

Codecov Report

Merging #6010 (55a4f7f) into release/2.0.0 (7b20c66) will decrease coverage by 1.84%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           release/2.0.0    #6010      +/-   ##
=================================================
- Coverage          86.96%   85.12%   -1.85%     
=================================================
  Files                 38       55      +17     
  Lines               3522     3865     +343     
  Branches             464      480      +16     
=================================================
+ Hits                3063     3290     +227     
- Misses               342      463     +121     
+ Partials             117      112       -5     

Impacted Files	Coverage Δ
securedrop/version.py	100.00% <100.00%> (ø)
...embic/versions/b060f38c0c31_drop_source_flagged.py	50.00% <0.00%> (ø)
...ions/523fff3f969c_add_versioned_instance_config.py	66.66% <0.00%> (ø)
...bic/versions/a9fe328b053a_migrations_for_0_14_0.py	57.14% <0.00%> (ø)
...versions/3d91d6948753_create_source_uuid_column.py	45.45% <0.00%> (ø)
...s/2d0ce3ee5bdc_added_passphrase_hash_column_to_.py	53.33% <0.00%> (ø)
...5cbab83_add_column_to_track_source_deletion_of_.py	40.00% <0.00%> (ø)
.../92fba0be98e9_added_organization_name_field_in_.py	66.66% <0.00%> (ø)
...bic/versions/35513370ba0d_add_source_deleted_at.py	66.66% <0.00%> (ø)
...op/alembic/versions/6db892e17271_add_reply_uuid.py	42.85% <0.00%> (ø)
... and 16 more

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[kushaldas]

Tested, approved.

• version updated correctly
• changelog accurate
• base of PR is release/2.0.0