Merge #6145: [v21.0.x] backport: v21.0.0-rc.3

cd0a3a6 Merge #6154: chore: remove trailing whitespaces in release notes (pasta)
6bc60a7 Merge #6151: chore: update seeds for v21 release (pasta)
88e949a Merge #6146: chore: bump assumevalid, minchainwork, checkpoints, chaintxdata (pasta)
cc14427 Merge #6144: docs: release notes for v21.0.0 (pasta)
0a8ece1 Merge #6122: chore: translations 2024-07 (pasta)
146d244 Merge #6140: feat: harden all sporks on mainnet to current values (pasta)
024d272 Merge #6126: feat: enable EHF activation of MN_RR on mainnet (pasta)
e780b3d Merge #6125: docs: update manpages for 21.0 (pasta)
5ede23c Merge #6118: docs: add release notes notifying change of default branch to `develop` (pasta)
1b6fe9c Merge #6117: docs: update supported versions in SECURITY.md (pasta)
27d20be Merge #6116: fix: mitigate crashes associated with some upgradetohd edge cases (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  Backports to v21 for rc.3; there are more PRs to be back ported here

  ## What was done?
  see commits

  ## How Has This Been Tested?

  ## Breaking Changes
  None

  ## Checklist:
    _Go over all the following points, and put an `x` in all the boxes that apply._
  - [x] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [x] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  UdjinM6:
    utACK cd0a3a6

Tree-SHA512: 0a8d027c5952fcb61317cc413a0de1f3152ae675c5690942400c3e4655cc6a803c702a7e1b18d8dac77aa0f483783f5cdbe29d6c0592165c4f0517d6f37b91a4

Author: PastaPastaPasta

SECURITY.md

@@ -4,9 +4,9 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 0.17    | :white_check_mark: |
-| 0.16    | :white_check_mark: |
-| < 0.16  | :x:                |
+| 21      | :white_check_mark: |
+| 20.1    | :white_check_mark: |
+| < 20.1  | :x:                |
 
 ## Reporting a Vulnerability
 

contrib/seeds/nodes_main.txt

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