Rebalance GHA runners to reduce ATs failure and speedup unit tests (#7656)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

.github/workflows/acceptance-tests.yml

@@ -12,7 +12,7 @@ concurrency:
 
 env:
   GRADLE_OPTS: "-Xmx7g"
-  total-runners: 12
+  total-runners: 14
 
 jobs:
   acceptanceTestEthereum:

.github/workflows/pre-review.yml

@@ -12,7 +12,7 @@ concurrency:
 
 env:
   GRADLE_OPTS: "-Xmx6g -Dorg.gradle.parallel=true"
-  total-runners: 8
+  total-runners: 10
 
 jobs:
   repolint:

.github/workflows/reference-tests.yml

@@ -8,7 +8,7 @@ on:
 
 env:
   GRADLE_OPTS: "-Xmx6g -Dorg.gradle.daemon=false -Dorg.gradle.parallel=true -Dorg.gradle.caching=true"
-  total-runners: 10
+  total-runners: 8
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}