Update CI runs

* Remove C++11/14 CI runs for CUB and Thrust
* Raise compiler minimum versions for C++17

ci/matrix.yaml

@@ -11,9 +11,10 @@ workflows:
 
   pull_request:
     # Old CTK
-    - {jobs: ['build'], std: 'minmax', ctk: '11.1', cxx: ['gcc6', 'gcc9', 'clang9', 'msvc2017']}
+    - {jobs: ['build'], std: 'minmax', ctk: '11.1', cxx: ['gcc7', 'gcc9', 'clang9', 'msvc2019']}
     # Current CTK build-only
-    - {jobs: ['build'], std: [11, 14], cxx: ['gcc7', 'clang9']}
+    - {jobs: ['build'], std: [11, 14], cxx: ['gcc7', 'clang9'], project: 'libcudacxx'}
+    - {jobs: ['build'], std: [17], cxx: ['gcc7', 'clang9']}
     - {jobs: ['build'], std: 'max', cxx: ['gcc8', 'gcc9', 'gcc10', 'gcc11', 'gcc12']}
     - {jobs: ['build'], std: 'max', cxx: ['clang10', 'clang11', 'clang12', 'clang13', 'clang14', 'clang15', 'clang16', 'clang17']}
     - {jobs: ['build'], std: 'max', cxx: ['intel', 'msvc2019']}
@@ -65,7 +66,7 @@ workflows:
     - {jobs: ['test_gpu'],  project: 'thrust', cmake_options: '-DTHRUST_DISPATCH_TYPE=Force32bit'}
     - {jobs: ['test_gpu'],  project: 'thrust', cmake_options: '-DTHRUST_DISPATCH_TYPE=Force64bit'}
     # Old CTK
-    - {jobs: ['build'], std: 'all', ctk: '11.1', cxx: ['gcc6', 'gcc7', 'gcc8', 'gcc9', 'clang9', 'msvc2017']}
+    - {jobs: ['build'], std: 'all', ctk: '11.1', cxx: ['gcc7', 'gcc8', 'gcc9', 'clang9', 'msvc2019']}
     - {jobs: ['build'], std: 'all', ctk: '11.8', cxx: ['gcc11'], sm: '60;70;80;90'}
     # Current CTK build-only
     - {jobs: ['build'], std: 'all', cxx: ['gcc7', 'gcc8', 'gcc9', 'gcc10', 'gcc11', 'gcc12']}
@@ -261,11 +262,11 @@ projects:
     stds: [11, 14, 17, 20]
   cub:
     name: 'CUB'
-    stds: [11, 14, 17, 20]
+    stds: [17, 20]
     job_map: { test: ['test_nolid', 'test_lid0', 'test_lid1', 'test_lid2'] }
   thrust:
     name: 'Thrust'
-    stds: [11, 14, 17, 20]
+    stds: [17, 20]
     job_map: { test: ['test_cpu', 'test_gpu'] }
   cudax:
     stds: [17, 20]