CI: replace deprecated method execute()

[nabim777]

Description

Recently, Nextcloud deprecated the query method execute() , as shown in this PR: nextcloud/server#55720
So, this PR replaces depreceated query methods execute() in DatabaseService with the recommended executeStatement() method.

Related Issue or Workpackage

• failed on psalm

Error: lib/Service/DatabaseService.php:98:11: UndefinedInterfaceMethod: Method OCP\DB\QueryBuilder\IQueryBuilder::execute does not exist (see https://psalm.dev/181)
Error: lib/Service/DatabaseService.php:114:11: UndefinedInterfaceMethod: Method OCP\DB\QueryBuilder\IQueryBuilder::execute does not exist (see https://psalm.dev/181)
Error: tests/lib/Service/DatabaseServiceTest.php:84:11: UndefinedInterfaceMethod: Method OCP\DB\QueryBuilder\IQueryBuilder::execute does not exist (see https://psalm.dev/181)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Updated CHANGELOG.md file

[github-actions]

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