[master] b22da84ee build: Bump libvarnishapi soname to 3.1.0

[Dridi Boukelmoune]

commit b22da84ee312a847c6ac9f27ae62a040f7b8fcda
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Aug 18 12:40:05 2023 +0200

    build: Bump libvarnishapi soname to 3.1.0

diff --git a/lib/libvarnishapi/Makefile.am b/lib/libvarnishapi/Makefile.am
index 264beb1da..b278eb6d9 100644
--- a/lib/libvarnishapi/Makefile.am
+++ b/lib/libvarnishapi/Makefile.am
@@ -8,7 +8,7 @@ AM_CPPFLAGS = \
 
 lib_LTLIBRARIES = libvarnishapi.la
 
-libvarnishapi_la_LDFLAGS = $(AM_LDFLAGS) -version-info 3:0:0
+libvarnishapi_la_LDFLAGS = $(AM_LDFLAGS) -version-info 4:0:1
 
 libvarnishapi_la_SOURCES = \
 	../../include/vcs_version.h \