htlcswitch+go.mod: use updated fn.ContextGuard

This commit updates the fn dep to the version containing the updates to
the ContextGuard implementation. Only the htlcswitch/link uses the guard
at the moment so this is updated to make use of the new implementation.

go.mod

@@ -215,3 +215,5 @@ go 1.22.6
 retract v0.0.2
 
 replace github.com/btcsuite/btclog/v2 => github.com/ellemouton/btclog/v2 v2.0.0-20241210110018-997ee6596623
+
+replace github.com/lightningnetwork/lnd/fn/v2 => github.com/ellemouton/lnd/fn/v2 v2.0.0-20241213084403-f99cabf7b429

go.sum

@@ -188,6 +188,8 @@ github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkp
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/ellemouton/btclog/v2 v2.0.0-20241210110018-997ee6596623 h1:qcTPGQ0m2YL+GkptbgDnICKcNYGfVy0Oy9WTnC9BosA=
 github.com/ellemouton/btclog/v2 v2.0.0-20241210110018-997ee6596623/go.mod h1:XItGUfVOxotJL8kkuk2Hj3EVow5KCugXl3wWfQ6K0AE=
+github.com/ellemouton/lnd/fn/v2 v2.0.0-20241213084403-f99cabf7b429 h1:oJ9xVdENFa2lQCgU2G0urGlAOcYgSgT46/iq/ClDphc=
+github.com/ellemouton/lnd/fn/v2 v2.0.0-20241213084403-f99cabf7b429/go.mod h1:TOzwrhjB/Azw1V7aa8t21ufcQmdsQOQMDtxVOQWNl8s=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -456,8 +458,6 @@ github.com/lightningnetwork/lnd/cert v1.2.2 h1:71YK6hogeJtxSxw2teq3eGeuy4rHGKcFf
 github.com/lightningnetwork/lnd/cert v1.2.2/go.mod h1:jQmFn/Ez4zhDgq2hnYSw8r35bqGVxViXhX6Cd7HXM6U=
 github.com/lightningnetwork/lnd/clock v1.1.1 h1:OfR3/zcJd2RhH0RU+zX/77c0ZiOnIMsDIBjgjWdZgA0=
 github.com/lightningnetwork/lnd/clock v1.1.1/go.mod h1:mGnAhPyjYZQJmebS7aevElXKTFDuO+uNFFfMXK1W8xQ=
-github.com/lightningnetwork/lnd/fn/v2 v2.0.4 h1:DiC/AEa7DhnY4qOEQBISu1cp+1+51LjbVDzNLVBwNjI=
-github.com/lightningnetwork/lnd/fn/v2 v2.0.4/go.mod h1:TOzwrhjB/Azw1V7aa8t21ufcQmdsQOQMDtxVOQWNl8s=
 github.com/lightningnetwork/lnd/healthcheck v1.2.6 h1:1sWhqr93GdkWy4+6U7JxBfcyZIE78MhIHTJZfPx7qqI=
 github.com/lightningnetwork/lnd/healthcheck v1.2.6/go.mod h1:Mu02um4CWY/zdTOvFje7WJgJcHyX2zq/FG3MhOAiGaQ=
 github.com/lightningnetwork/lnd/kvdb v1.4.11 h1:fk1HMVFrsVK3xqU7q+JWHRgBltw/a2qIg1E3zazMb/8=