Bump version to 0.16.0

[gmarkall]

• Updates for recent API changes (Updates for recent API changes #313)
• Fix lineinfo generation when compile_internal used ([BUG] Setting lineinfo=true for a kernel also enable debug building. #271) (Fix lineinfo generation when compile_internal used (#271) #287)
• Build docs with NVIDIA Sphinx theme (Build docs with NVIDIA Sphinx theme #312)
• Don't skip debug tests when LTO enabled by default (Don't skip debug tests when LTO enabled by default #311)
• Use cuda.bindings and cuda.core for Linker (Use cuda.bindings and cuda.core for Linker #133)
• Enable LTO by default when pynvjitlink is available (Enable LTO by default when pynvjitlink is available #310)

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[gmarkall]

/ok to test

[gmarkall]

The Python 3.9, CUDA 11.8 conda config hung on the first run, at:

test_pinned (numba.cuda.tests.cudadrv.test_pinned.TestPinned) ... ok
test_unpinned (numba.cuda.tests.cudadrv.test_pinned.TestPinned) ... ok
test_profiling (numba.cuda.tests.cudadrv.test_profiler.TestProfiler) ... ok
test_ptds (numba.cuda.tests.cudadrv.test_ptds.TestPTDS) ... skipped 'Function names unchanged for PTDS with NV Binding'
test_reset_device (numba.cuda.tests.cudadrv.test_reset_device.TestResetDevice) ... ok
test_select_device (numba.cuda.tests.cudadrv.test_select_device.TestSelectDevice) ... ok
test_add_callback (numba.cuda.tests.cudadrv.test_streams.TestCudaStream) ... ok
test_add_callback_with_default_arg (numba.cuda.tests.cudadrv.test_streams.TestCudaStream) ... ok
test_async_done (numba.cuda.tests.cudadrv.test_streams.TestCudaStream) ... ok
test_cancelled_future (numba.cuda.tests.cudadrv.test_streams.TestCudaStream) ... ok
test_multiple_async_done (numba.cuda.tests.cudadrv.test_streams.TestCudaStream) ... ok
test_multiple_async_done_multiple_streams (numba.cuda.tests.cudadrv.test_streams.TestCudaStream) ... ok

It passed on a subsequent re-run. Whilst this makes me a bit nervous, I'm not sure what to do besides merging this PR and keeping an eye out for potential issues in CI in future.