deps: update to libpathrs v0.2.5

This update includes a few breaking API changes that I needed to get in
before an actual runc release depends on it, so that we don't need to
deal with compatibility shims for them (or bumping the SOVERSION).

From a Go API perspective, there were no major changes -- though this
bump did also require a bump to github.com/cyphar/filepath-securejoin
because one of the wrapped APIs changed from int to uint64 as a flag
argument type. Again, better to get this done before we really depend on
this in a public way.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

script/release_build.sh

@@ -20,7 +20,7 @@ set -e
 # Project-specific options and functions. In *theory* you shouldn't need to
 # touch anything else in this script in order to use this elsewhere.
 : "${LIBSECCOMP_VERSION:=2.6.0}"
-: "${LIBPATHRS_VERSION:=0.2.4}"
+: "${LIBPATHRS_VERSION:=0.2.5}"
 project="runc"
 root="$(readlink -f "$(dirname "${BASH_SOURCE[0]}")/..")"