p/git-buildpackage.spec: Fix version to align to latest tag

Currently base tag is "debian/0.9.39".

BTW would it make sense to have upstream tags without debian prefixes ?

Origin: https://salsa.debian.org/agx/git-buildpackage/-/merge_requests/83
Forwarded: #97
Signed-off-by: Philippe Coval <philippe.coval@vates.tech>

Author: rzr

packaging/git-buildpackage.spec

@@ -9,7 +9,7 @@
 
 Name:       git-buildpackage
 Summary:    Build packages from git
-Version:    0.9.38
+Version:    0.9.39
 Release:    0
 Group:      Development/Tools/Building
 License:    GPLv2