Use foundry stable version in the playground docker image (#3255)

# Description
It was noticed by @ahhda that the test playground CI job [started to
fail
constantly](https://github.com/cowprotocol/services/actions/runs/12898722916).
Seems like one of the nightly [foundry-rs
releases](https://github.com/foundry-rs/foundry/releases) was the main
reason for this. Even though the
[stable](https://github.com/foundry-rs/foundry/releases/tag/stable)
release is marked as `latest`, according to the logs, a dev version of
`anvil` was used.

# Changes

- [ ] Switch from the `latest` to `stable` version.
- [ ] Fix autopilot driver config updated due to
#3065

## How to test
https://github.com/cowprotocol/services/actions/runs/13018157686?pr=3254

playground/docker-compose.fork.yml

@@ -1,7 +1,7 @@
 version: "3.9"
 services:
   chain:
-    image: ghcr.io/foundry-rs/foundry:latest
+    image: ghcr.io/foundry-rs/foundry:stable
     restart: always
     entrypoint: /usr/local/bin/anvil
     command: --fork-url ${ETH_RPC_URL} --block-time 12
@@ -110,7 +110,7 @@ services:
       - SOLVER_TIME_LIMIT=5
       - PRICE_ESTIMATION_DRIVERS=baseline|http://driver/baseline
       - NATIVE_PRICE_ESTIMATORS=baseline|http://driver/baseline
-      - DRIVERS=baseline|http://driver/baseline
+      - DRIVERS=baseline|http://driver/baseline|0xa0Ee7A142d267C1f36714E4a8F75612F20a79720
       - SKIP_EVENT_SYNC=true
       - BASELINE_SOURCES=None
       - RUST_BACKTRACE=1