rename Solo[constructor] to MkSolo

Part of proposal 475 (https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0475-tuple-syntax.rst)

Tracking ticket: #21294

Submodule changes:

• text: bump ghc-prim
• deepseq: use MkSolo
• haddock: Use GHC.Tuple.Prim in test output

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