v6.50.0

OrdinaryDiffEq v6.50.0

Diff since v6.49.4

Closed issues:

• New RK cofficients of Alshina, Zaks, and Kalitkin (#1610)
• No git tag for 6.38 (#1844)
• sol.retcode == :Success is not recognized correctly (#1916)
• Precompilation fails when updating (#1919)

Merged pull requests:

• Adding Alshina2, Alshina3, Alshin6 from Alshina, Zaks, and Kalitkin (2008) (#1898) (@ayushinav)
• Fix some typos (#1918) (@goggle)
• Add CG4a method (#1921) (@ErikQQY)
• Fix the broken link (#1922) (@moonpiee)
• fix ROCK2/ROCK4 for arrays of SVectors (#1925) (@ranocha)