Fix Stax/Flex: incomplete APDU is returned #96

Job	Run time
Build binary used to check signture during the test	2m 48s
Build application using the reusable workflow / Retrieve application metadata / Retrieve application metadata	8s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (stax)	2m 22s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanosp)	2m 16s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanox)	2m 14s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (flex)	2m 25s
Build application using the reusable workflow / Merge build artifacts	1m 14s
Run ragger tests using the reusable workflow / Retrieve application metadata / Retrieve application metadata	7s
Run ragger tests using the reusable workflow / Functional tests with Ragger (nanosp)	1m 19s
Run ragger tests using the reusable workflow / Functional tests with Ragger (nanox)	1m 20s
Run ragger tests using the reusable workflow / Functional tests with Ragger (stax)	2m 0s
Run ragger tests using the reusable workflow / Functional tests with Ragger (flex)	1m 53s
Run ragger tests using the reusable workflow / Merge snapshots artifacts	3s
Run ragger tests using the reusable workflow / Open a PR with the new snapshots	0s
	20m 9s

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