Merge branch 'feature/fix-cgsolver-reduction' into 'master'

Andreas Dednerrequested to merge
cherry-pick-676d3a38-2 into releases/2.6

[preconditioners] fix type of CGSolver reduction parameter after recent updates

See merge request !132 (merged)

(cherry picked from commit 676d3a38)

6e85bbd7 [preconditioners] fix type of CGSolver reduction parameter after recent updates

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