discuss: Bump OpenDAL MSRV to 1.80

[Xuanwo]

Hello everyone, I'm starting this discussion to determine whether it's a good idea to raise OpenDAL's MSRV to 1.80.

Based our discussion at #5256, we have the recent month data like:

Version	Percent
1.87.0-nightly	4.12%
1.86.0-nightly	4.85%
1.86.0-beta.5	4.93%
1.86.0-beta.1	5.27%
1.85.1	12.07%
1.85.0-nightly	14.73%
1.85.0	42.71%
1.84.1	48.00%
1.84.0-nightly	48.50%
1.84.0	57.55%
1.83.0-nightly	58.76%
1.83.0	66.89%
1.82.0-nightly	67.33%
1.82.0	69.72%
1.81.0-nightly	70.03%
1.81.0	85.10%
1.80.1	91.03%
1.80.0-nightly	91.11%
1.80.0	91.55%

In general, 90% users are using rust 1.80.0 and newer.

What do you think?

[tisonkun]

+1 for bumping MSRV to 1.80

[koushiro]

another data source about rust version: bottom of https://lib.rs/stats

[tisonkun]

This seems calculate the percentage in the opposite direction.

[Xuanwo]

Nice stats.

[Xuanwo]

We can use https://lib.rs/stats directly in the future.

[morristai]

+1 for bumping to 1.80.