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>

Dockerfile

@@ -1,7 +1,7 @@
 ARG GO_VERSION=1.25
 ARG BATS_VERSION=v1.12.0
 ARG LIBSECCOMP_VERSION=2.6.0
-ARG LIBPATHRS_VERSION=0.2.4
+ARG LIBPATHRS_VERSION=0.2.5
 
 FROM golang:${GO_VERSION}-trixie
 ARG DEBIAN_FRONTEND=noninteractive