fix: use all params for cache key

[amacar]

Requesting head block with finalized=true sometimes returns block with finalized=false property.
Adding all params to cache key should prevent this.

Maybe you can consider increasing LRU cache a bit, default is only storing 2 items.

Test script which seems to be working fine when including fix from this PR

SAS_SUBSTRATE_URL=wss://rpc-shadow.crust.network/
SAS_EXPRESS_PORT=8070

#!/usr/bin/env bash

set -euo pipefail

while true; do
    nonfinalized=$(curl -s "http://localhost:8070/blocks/head?finalized=false" | jq -r .finalized)
    echo "Finalized block: $nonfinalized"
    finalized=$(curl -s "http://localhost:8070/blocks/head?finalized=true" | jq -r .finalized)

    if [[ "$finalized" == "false" ]]; then
        echo "❌ Error: Block is not finalized!"
        exit 1
    elif [[ "$finalized" == "true" ]]; then
        echo "✅ Block is finalized."
    else
        echo "⚠️ Unexpected response: $finalized"
    fi

    sleep 5s
done

[cla-bot-2021]

User @amacar, please sign the CLA here.

[andrew-ifrita]

Looks good to me. Thanks for your contribution.

Let me get 1-2 more pair of eyes to check things out and then we can merge and release, hopefully.

[filvecchiato]

Looks good to me!