use SYSTEM template constant to indicate that CUDA dependency of torchvision uses system toolchain

[boegel]

(created using eb --new-pr)

Easyconfigs test suite is broken since #16294 was merged (because #16384 got merged after tests for #16294 completed):

FAIL: test__parse_easyconfig_torchvision-0.13.1-foss-2022a-CUDA-11.7.0.eb (test.easyconfigs.easyconfigs.EasyConfigTest)
Test for easyconfig torchvision-0.13.1-foss-2022a-CUDA-11.7.0.eb
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test/easyconfigs/easyconfigs.py", line 1502, in innertest
    template_easyconfig_test(self, spec_path)
  File "test/easyconfigs/easyconfigs.py", line 1477, in template_easyconfig_test
    self.fail(error_msg)
AssertionError: use of `True` to indicate the system toolchain for dependency CUDA is deprecated, use the `SYSTEM` template constant instead

[boegel]

@boegelbot please test @ generoso

[boegelbot]

@boegel: Request for testing this PR well received on login1

PR test command 'EB_PR=16418 EB_ARGS= /opt/software/slurm/bin/sbatch --job-name test_PR_16418 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 9296

Test results coming soon (I hope)...

- notification for comment with ID 1279771063 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[verdurin]

Looks fine.

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
cns1 - Linux Rocky Linux 8.5, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz (haswell), Python 3.6.8
See https://gist.github.com/811aa5439077a7b16e73fe06726917b2 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 2 out of 2 (1 easyconfigs in total)
node3900.accelgor.os - Linux RHEL 8.4, x86_64, AMD EPYC 7413 24-Core Processor (zen3), 2 x NVIDIA [Unknown Error], 520.61.05, 2 x NVIDIA NVIDIA A100-SXM4-80GB, 520.61.05, Python 3.6.8
See https://gist.github.com/68cc177d69b49de549163f860bb04417 for a full test report.

[verdurin]

Test report by @verdurin
FAILED
Build succeeded for 5 out of 9 (1 easyconfigs in total)
centos7.lan - Linux CentOS Linux 7.9.2009, x86_64, Intel Core Processor (Skylake, IBRS), Python 3.6.8
See https://gist.github.com/cbbaed6d7c984d325c547f827fcfed7c for a full test report.