chore(ci): use manual x-dist value for self-hosted runners (#1296)

* chore(ci): use manual x-dist value for self-hosted runner.

* chore(docs): update changelog.

Author: spencer-tb

.github/configs/evm-impl.yaml

@@ -1,15 +1,14 @@
 eels:
   evm-bin: ethereum-spec-evm-resolver
-  x-dist: auto
+  x-dist: 10
 geth:
   evm-bin: evm
-  x-dist: auto
 evmone:
   evm-bin: evmone-t8n
-  x-dist: auto
+  x-dist: 10
 besu:
   evm-bin: evmtool
   x-dist: 0
 ethjs:
   evm-bin: ethereumjs-t8ntool.sh
-  x-dist: auto
+  x-dist: 10

.github/configs/feature.yaml

@@ -12,7 +12,3 @@ eip7692:
   fill-params: --fork=Osaka ./tests/osaka
   solc: 0.8.21
   eofwrap: true
-pectra-devnet-6:
-  evm-type: pectra-devnet-6
-  fill-params: --until=Prague
-  solc: 0.8.21

docs/CHANGELOG.md

@@ -34,6 +34,7 @@ The following changes may be potentially breaking (all clients were tested with
 - ✨ Update `mypy` to latest release `>=1.15.0,<1.16` ([#1209](https://github.com/ethereum/execution-spec-tests/pull/1209)).
 - 🐞 Bug fix for filling with EELS for certain Python versions due to an issue with CPython ([#1231](https://github.com/ethereum/execution-spec-tests/pull/1231)).
 - 🐞 Fix HTML site deployment due to the site's index file exceeding Github's max file size limit ([#1292](https://github.com/ethereum/execution-spec-tests/pull/1292)).
+- ✨ Update the build fixtures workflow to use multiple self-hosted runners, remove `pectra-devnet-6` feature build ([#1296](https://github.com/ethereum/execution-spec-tests/pull/1296)).
 
 ### 🧪 Test Cases