Change stabilization version of no_std from 1.0 to 1.6.
I don't know if more than this is needed.
Fixes rust-lang#35579.

Change stabilization version of no_std from 1.0 to 1.6.
I don't know if more than this is needed.
Fixes rust-lang#35579.

Rollup of 30 pull requests
- Successful merges: #34941, #35392, #35444, #35447, #35491, #35533, #35539, #35558, #35573, #35574, #35577, #35586, #35588, #35594, #35596, #35597, #35598, #35606, #35611, #35615, #35616, #35620, #35622, #35640, #35643, #35644, #35646, #35647, #35648, #35661
- Failed merges: #35395, #35415