dockerfile: drop libtesseract5 #349

Job	Run time
Build, stable, linux/arm64	1h 58m 18s
Build, stable, linux/amd64	10m 27s
Test novolume, stable, linux/amd64	2m 51s
Test basic, stable, linux/amd64	2m 46s
Test, stable, linux/amd64	2h 41m 7s
Anchore Container Scan, linux/amd64	2m 30s
Test SAML, stable, linux/amd64	3m 51s
Test split, stable, linux/amd64	3m 50s
Test SSL, stable, linux/amd64	2m 46s
Trivy Container Scan, linux/amd64	2m 45s
Publish to GitHub, stable	0s
Publish to Docker Hub, stable	0s
	5h 11m 11s

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