litCI: try switching A100 to L4 for oldest suites

Author: Borda

.lightning/workflows/fabric.yml

@@ -12,7 +12,7 @@ parametrize:
     - image: "nvidia/cuda:12.1.1-runtime-ubuntu22.04"
       PACKAGE_NAME: "fabric"
       python_version: "3.10"
-      machine: "A100_X_2"
+      machine: "L4_X_2"
     - image: "nvidia/cuda:12.6.3-runtime-ubuntu22.04"
       PACKAGE_NAME: "fabric"
       python_version: "3.12"

.lightning/workflows/pytorch.yml

@@ -12,7 +12,7 @@ parametrize:
     - image: "nvidia/cuda:12.1.1-runtime-ubuntu22.04"
       PACKAGE_NAME: "pytorch"
       python_version: "3.10"
-      machine: "A100_X_2"
+      machine: "L4_X_2"
     - image: "nvidia/cuda:12.6.3-runtime-ubuntu22.04"
       PACKAGE_NAME: "pytorch"
       python_version: "3.12"