update docker-proxy to 7b2b1feb1de4817d522cc372af149ff48d25028e

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

hack/dockerfile/binaries-commits

@@ -4,6 +4,6 @@ TOMLV_COMMIT=9baf8a8a9f2ed20a8e54160840c492f937eeaf9a
 RUNC_COMMIT=51371867a01c467f08af739783b8beafc154c4d7
 CONTAINERD_COMMIT=03e5862ec0d8d3b3f750e19fca3ee367e13c090e
 TINI_COMMIT=949e6facb77383876aeff8a6944dde66b3089574
-LIBNETWORK_COMMIT=0f534354b813003a754606689722fe253101bc4e
+LIBNETWORK_COMMIT=7b2b1feb1de4817d522cc372af149ff48d25028e
 VNDR_COMMIT=f56bd4504b4fad07a357913687fb652ee54bb3b0
 BINDATA_COMMIT=a0ff2567cfb70903282db057e799fd826784d41d