Require DPC++ >=2023.0.0, no need to require c-compiler

[oleksandr-pavlyk]

Dropping - {{ compiler('c') }} and bumping up minimal version of DPC++.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1078/index.html

[coveralls]

Coverage: 82.296%. Remained the same when pulling b4b05f0 on drop-compiler-c into 0304cdc on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev2=py310h76be34b_33 ran successfully.
Passed: 33
Failed: 801
Skipped: 280

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev2=py310h76be34b_33 ran successfully.
Passed: 33
Failed: 801
Skipped: 280