Release candidate 0.25.2

Release candidate 0.25.2

store: Fix the logic for determining if a graft was pending (again) (g…

…raphprotocol#3289)

The previous version of the code was being too clever: the signal for
whether a graft is pending is whether the subgraph's block ptr is null or
not. The check whether the block ptr had progressed beyond the graft point
was too defensive and made it impossible to graft onto block 0, as well as
breaking a test.

graph, runtime: Update `ethabi` to its latest version

Release 0.25.1

Release 0.25.1

graphql: Treat missing variables as null values

Instead of immediately reporting an error, treat missing variables as nulls
and let the rest of the execution logic deal with nulls

chain head listener: could log be reordered?

chain head listener: add blocking thread pool contention check

chain head listener: more logs