PR #15559 inadvertently updated the `execution-spec-tests` submodule,
leading to CI
[failures](https://github.com/erigontech/erigon/actions/runs/15820036954/job/44587011094)
like
````
TestExecutionSpecBlockchain/osaka/eip7918_blob_reserve_price/blob_base_fee/reserve_price_various_base_fee_scenarios.json/tests/osaka/eip7918__base_fee_per_gas_17]_38 (0.00s)
            block_test.go:79: unsupported fork "Osaka"
````

…h test (#15680)

We need to wait for the snapshots to be recreated.

This fixes an issue with erigon during the Heimdall v1->V2 migration
where

1. Erigon waits for hiemdall to get into sync - which is not going to
happen for a potentially long period of time (several hours)
2. On syncing Erigon stalls because it can't fetch enough backward
headers due to loack of milestones and checkpoints

This adds code to exec to set a shortened prune timeout in exec if we're
processing at the tip. This fix applies the same rules about timeouts in
exec that pruning in the sync loop does,