Merge pull request #1837 from CEED/jed/ci-noether-cuda-12.9

* ci: noether CUDA_DIR=/usr/local/cuda-12.9
* makefiles: update defaults from c99 to c11
* tidy: -clang-analyzer-security.insecureAPI.Depr

Merge pull request #1837 from CEED/jed/ci-noether-cuda-12.9

* ci: noether CUDA_DIR=/usr/local/cuda-12.9
* makefiles: update defaults from c99 to c11
* tidy: -clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling
* ci: noether rocm-6.3

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makefiles: update defaults from c99 to c11

cuda-12.9 contains anonymous unions, which are not in c99. But c11 is
widely supported these days so it seems fair to update.

One nit is that c11 does not

makefiles: update defaults from c99 to c11

cuda-12.9 contains anonymous unions, which are not in c99. But c11 is
widely supported these days so it seems fair to update.

One nit is that c11 does not require VLA, and libCEED uses VLA-pointers
internally for some purposes.

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New Python Examples (#1817)

* ex1-volume python example (#1804)

* Adds initial ex1 python example

* Update examples/python/ex1-volume.py

* after make format

* formatting change

* modifies main

New Python Examples (#1817)

* ex1-volume python example (#1804)

* Adds initial ex1 python example

* Update examples/python/ex1-volume.py

* after make format

* formatting change

* modifies main

* adds strided restriction

* Update examples/python/ex1-volume.py

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ex - add python version of ex1 volume

* ex2_Surface implementation in python (#1802)

* Add files via upload

* Update ex2_surface.py

* Update ex2_surface.py

* Update ex2_surface.py

* Update ex2_surface.py

* Update ex2_surface.py

* Update ex2_surface.py

* Update ex2_surface.py

* Delete examples/ceed/ex2_surface.py

* Add cleaned and formatted ex2_surface.py example

* style: update header and reformat ex2_surface.py

* Delete examples/ceed/ex2_surface.py

* Python Surface area example

----------------------------------------

ex - add ex2 surface example in python

* ex - consolidate common py code

* ex - add py gallery option

* ex - add py test harness

* ex3 volume python example

* ex - switch ex3 to use common python code

* ci - add new python examples to testing

---------

Co-authored-by: katayoonk <122122167+katayoonk@users.noreply.github.com>
Co-authored-by: Surinder singh chhabra <93762514+arrowguy234@users.noreply.github.com>
Co-authored-by: Arshia Ilaty <arshia.ilaty99@gmail.com>

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