chore: Bump version to 0.3.4 on the dev-branch

DESCRIPTION

 Type: Package
 Package: RFSurrogates
 Title: Surrogate Minimal Depth Variable Importance
-Version: 0.3.3
+Version: 0.3.4
 Authors@R: c(
     person("Stephan", "Seifert", , "stephan.seifert@uni-hamburg.de", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0003-2567-5728")),

NEWS.md

-# RFSurrogates (development version)
+# RFSurrogates 0.3.4
 
 <!-- News Style-guide: https://style.tidyverse.org/news.html -->