Merge #6157: chore: set release to true

98a3393 chore: set release to true (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  Sets release flag to true.

  ## 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
  - [ ] 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 98a3393

Tree-SHA512: 2dfe7097eaad936fa426186233e9088c7fe41a33277cee9e4ff88061e9f68ad76741d4e7e6204294687edad9d16083a1af0375b0b572ff144e6051c429860699

Author: PastaPastaPasta

configure.ac

@@ -3,7 +3,7 @@ dnl Don't forget to push a corresponding tag when updating any of _CLIENT_VERSIO
 define(_CLIENT_VERSION_MAJOR, 21)
 define(_CLIENT_VERSION_MINOR, 0)
 define(_CLIENT_VERSION_BUILD, 0)
-define(_CLIENT_VERSION_IS_RELEASE, false)
+define(_CLIENT_VERSION_IS_RELEASE, true)
 define(_COPYRIGHT_YEAR, 2024)
 define(_COPYRIGHT_HOLDERS,[The %s developers])
 define(_COPYRIGHT_HOLDERS_SUBSTITUTION,[[Dash Core]])