Update fastcache pin

[Tristan-Wilson]

Updating module as per discussion in #2455

[eljobe]

LGTM

[PlasmaPower]

LGTM, but is this required for #2455 ? Shouldn't that PR allow the current commit because it's an ancestor of fastcache master which merges it in?

[Tristan-Wilson]

LGTM, but is this required for #2455 ? Shouldn't that PR allow the current commit because it's an ancestor of fastcache master which merges it in?

You are correct, it doesn't appear to be required.

$ for mod in `git submodule --quiet foreach 'echo $name'`; do (cd $mod; if git merge-base --is-ancestor HEAD origin/HEAD; then echo OK $mod; else echo DIVERGENT $mod; fi); done
OK arbitrator/langs/bf
DIVERGENT arbitrator/langs/c
DIVERGENT arbitrator/langs/rust
DIVERGENT arbitrator/tools/wasmer
OK arbitrator/wasm-libraries/soft-float/SoftFloat
OK arbitrator/wasm-testsuite/testsuite
OK brotli
DIVERGENT contracts
OK fastcache
OK go-ethereum
OK nitro-testnode

Not sure why it was showing up before.

[PlasmaPower]

Not sure why it was showing up before.

I hadn't merged in the corresponding fastcache PR yet