MailService - fix email structure with multiple attachments #191

Job	Run time
ci / Generate job matrix	10s
ci / QA Checks (PHPUnit [8.4, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	24s
ci / QA Checks (PHPUnit [8.3, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	25s
ci / QA Checks (PHPUnit [8.5, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	32s
ci / QA Checks (PHPUnit [8.2, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	29s
ci / QA Checks (PHPUnit [8.4, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	28s
ci / QA Checks (PHPUnit [8.5, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	23s
ci / QA Checks (PHPUnit [8.3, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	26s
ci / QA Checks (PHPUnit [8.2, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	22s
ci / QA Checks (PHPCodeSniffer [8.2, latest], ubuntu-latest, laminas/laminas-continuous-integration-ac...	25s
ci / QA Checks (Backward Compatibility Check [@default, latest], ubuntu-latest, laminas/laminas-contin...	30s
ci / QA Checks (PHPStan [8.2, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	27s
	5m 1s

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