news: update v0.31.0-rc.1 release notes

Author: Filippo Costa

NEWS.md

@@ -43,6 +43,7 @@
 - Handler timeouts would sometimes be reported as deterministic errors with the error message `Subgraph instance failed to run: Failed to call 'asc_type_id' with [...] wasm backtrace [...]`; this error is now nondeterministic and recoverable. [#4475](https://github.com/graphprotocol/graph-node/pull/4475)
 - Fixed faulty exponential request backoff behavior after many minutes of failed requests, caused by an overflow. [#4421](https://github.com/graphprotocol/graph-node/pull/4421)
 - `json.fromBytes` and all `BigInt` operations now require more gas, protecting against malicious subgraphs. [#4594](https://github.com/graphprotocol/graph-node/pull/4594), [#4595](https://github.com/graphprotocol/graph-node/pull/4595)
+- Fixed a Rust panic on program startup when mixing Firehose and RPC providers. [#4680](https://github.com/graphprotocol/graph-node/pull/4680)
 
 ### Graphman
 - `graphman rewind` now requires `block-number` and `block-hash` to be passed as flags instead of arguments. [#4400](https://github.com/graphprotocol/graph-node/pull/4400)