debian: Bump so version to link against new libosmovty2

Debian doesn't have reverse dependencies so we need to bump the
SO version to have libosmoabis and libosmotrau link against our
new version.
diff --git a/debian/control b/debian/control
index 86e6f80..eed3a4c 100644
--- a/debian/control
+++ b/debian/control
@@ -11,20 +11,20 @@
 Package: libosmo-abis
 Section: oldlibs
 Architecture: any
-Depends: libosmoabis4 (= ${binary:Version}), libosmotrau0 (= ${binary:Version}), ${misc:Depends}
+Depends: libosmoabis5 (= ${binary:Version}), libosmotrau1 (= ${binary:Version}), ${misc:Depends}
 Multi-Arch: same
 Description: Legacy package for libosmo-abis
  libosmo-abis is an empty package helping in the transition to one
  package per DSO.
 
-Package: libosmoabis4
+Package: libosmoabis5
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Multi-Arch: same
 Description: GSM A-bis handling
 
-Package: libosmotrau0
+Package: libosmotrau1
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
@@ -34,7 +34,7 @@
 Package: libosmo-abis-dev
 Section: libdevel
 Architecture: any
-Depends: ${misc:Depends}, libosmotrau0 (= ${binary:Version}), libosmoabis4 (= ${binary:Version})
+Depends: ${misc:Depends}, libosmotrau1 (= ${binary:Version}), libosmoabis5 (= ${binary:Version})
 Multi-Arch: same
 Description: Development headers for A-bis interface.
 
@@ -42,6 +42,6 @@
 Section: debug
 Architecture: any
 Priority: extra
-Depends: libosmoabis4 (= ${binary:Version}), libosmotrau0 (= ${binary:Version}), ${misc:Depends}
+Depends: libosmoabis5 (= ${binary:Version}), libosmotrau1 (= ${binary:Version}), ${misc:Depends}
 Multi-Arch: same
 Description: Debug symbols for A-bis interface.