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Fix a crash when renaming a variable (in executeRenameAction)

Jonathan Verner requested to merge verner/kdevelop:fix/BUG-444567-lock-duchain-in-executeRenameAction into master

When renaming a variable, the function BasicRefactoring::executeRenameAction calls the isValid method of IndexedDeclaration which is documented to require the DUChain to be read locked. However the function does no such locking. This commit introduces a lock around the two calls.

BUG: 444567

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