Replace deprecated ASN1OutputStream constructor removed in Bouncy Castle 1.70

Jonas Witschelrequested to merge
diabonas/pdftk:fix-bcprov-1.70 into master

This constructor is deprecated and has been removed in Bouncy Castle 1.70, leading to build failures:

    [javac] /home/diabonas/pdftk/java/com/gitlab/pdftk_java/com/lowagie/text/pdf/PdfPKCS7.java:299: error: cannot find symbol
    [javac]             ASN1OutputStream dout = new ASN1OutputStream.create(bOut);
    [javac]                                                         ^
    [javac]   symbol:   class create
    [javac]   location: class ASN1OutputStream
Edited by Jonas Witschel

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