Fix MindOpt floating release (#429)

* Fix mindopt floating release

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Fabian Hofmann <[email protected]>

Author: 3 people

linopy/solvers.py

@@ -2231,6 +2231,7 @@ def get_solver_solution() -> Solution:
         solution = self.safe_get_solution(status=status, func=get_solver_solution)
         solution = maybe_adjust_objective_sign(solution, io_api, sense)
 
+        m.dispose()
         env_.dispose()
 
         return Result(status, solution, m)