CI/SLOTHY: Switch to c8g.8xlarge

Signed-off-by: Hanno Becker <[email protected]>

Author: hanno-becker

.github/workflows/slothy.yml

@@ -17,7 +17,7 @@ jobs:
     uses: ./.github/workflows/ci_ec2_reusable.yml
     with:
       name: SLOTHY
-      ec2_instance_type: c8g.4xlarge
+      ec2_instance_type: c8g.8xlarge
       ec2_ami: ubuntu-latest (custom AMI)
       ec2_ami_id: ami-08ddb0acd99dc3d33 # aarch64, ubuntu-latest, 64g
       lint: false