Remove CUDA 11 from dependencies.yaml (rapidsai#151)

Issue: rapidsai/build-planning#184

Authors:
  - Kyle Edwards (https://github.com/KyleFromNVIDIA)

Approvers:
  - https://github.com/jakirkham

URL: rapidsai#151

Author: KyleFromNVIDIA

conda/environments/all_cuda-118_arch-aarch64.yaml

@@ -3,7 +3,7 @@ files:
   all:
     output: [conda]
     matrix:
-      cuda: ["11.8", "12.8"]
+      cuda: ["12.8"]
       arch: [x86_64, aarch64]
     includes:
       - checks
@@ -79,22 +79,6 @@ dependencies:
     specific:
       - output_types: conda
         matrices:
-          - matrix:
-              cuda: "11.2"
-            packages:
-              - cuda-version=11.2
-          - matrix:
-              cuda: "11.4"
-            packages:
-              - cuda-version=11.4
-          - matrix:
-              cuda: "11.5"
-            packages:
-              - cuda-version=11.5
-          - matrix:
-              cuda: "11.8"
-            packages:
-              - cuda-version=11.8
           - matrix:
               cuda: "12.0"
             packages:
@@ -193,13 +177,9 @@ dependencies:
     specific:
       - output_types: [pyproject, requirements]
         matrices:
-          - matrix: {cuda: "12.*"}
+          - matrix: # All CUDA 12 versions
             packages:
               - cupy-cuda12x>=12.0.0
-          - matrix: {cuda: "11.*"}
-            packages: &cupy_packages_cu11
-              - cupy-cuda11x>=12.0.0
-          - {matrix: null, packages: *cupy_packages_cu11}
   depends_on_cudf:
     common:
       - output_types: conda
@@ -218,11 +198,6 @@ dependencies:
               cuda_suffixed: "true"
             packages:
               - cudf-cu12==25.8.*,>=0.0.0a0
-          - matrix:
-              cuda: "11.*"
-              cuda_suffixed: "true"
-            packages:
-              - cudf-cu11==25.8.*,>=0.0.0a0
           - {matrix: null, packages: [*cudf_unsuffixed]}
   depends_on_pylibcugraph:
     common:
@@ -242,9 +217,4 @@ dependencies:
               cuda_suffixed: "true"
             packages:
               - pylibcugraph-cu12==25.8.*,>=0.0.0a0
-          - matrix:
-              cuda: "11.*"
-              cuda_suffixed: "true"
-            packages:
-              - pylibcugraph-cu11==25.8.*,>=0.0.0a0
           - {matrix: null, packages: [*pylibcugraph_unsuffixed]}

conda/environments/all_cuda-118_arch-x86_64.yaml

@@ -33,7 +33,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 dependencies = [
-    "cupy-cuda11x>=12.0.0",
+    "cupy-cuda12x>=12.0.0",
     "networkx>=3.2",
     "numpy>=1.23,<3.0a0",
     "pylibcugraph==25.8.*,>=0.0.0a0",