build: bump version to 0.4.3
build: bump version to 0.4.3

we've had a bunch of internal changes, so lets go ahead and bump this
again.

Machyne/libbson,rayyang2000/libbson,remicollet/libbson,derickr/libbson,remicollet/libbson,Convey-Compliance/libbson,rcsanchez97/libbson,ksuarz/libbson,Machyne/libbson,paulmelnikow/libbson,mapr/libbson,remicollet/libbson,Convey-Compliance/libbson,rayyang2000/libbson,Convey-Compliance/libbson,jqk6/libbson,mongodbinc-interns/libbson,alexeyvo/libbson,rcsanchez97/libbson,ksuarz/libbson,4Second2None/libbson_tmp,rcsanchez97/libbson,4Second2None/libbson_tmp,bjori/libbson,mapr/libbson,paulmelnikow/libbson,derickr/libbson,4Second2None/libbson_tmp,ksuarz/libbson,mongodbinc-interns/libbson,remicollet/libbson,ajdavis/libbson,bjori/libbson,mongodb/libbson,ajdavis/libbson,paulmelnikow/libbson,derickr/libbson,Machyne/libbson,bjori/libbson,4Second2None/libbson_tmp,paulmelnikow/libbson,derickr/libbson,Machyne/libbson,mapr/libbson,rayyang2000/libbson,alexeyvo/libbson,mongodb/libbson,jqk6/libbson,mongodb/libbson,rayyang2000/libbson,paulmelnikow/libbson,jqk6/libbson,jqk6/libbson,alexeyvo/libbson,mongodbinc-interns/libbson,ajdavis/libbson,mongodbinc-interns/libbson