Update to Rust 1.88

[melroy12]

Which issue does this PR close?

• Closes Update workspace to use Rust 1.88 #16655.

Rationale for this change

Improve build times.

What changes are included in this PR?

Rust 1.88.0 is properly configured and active
All toolchain components (rustfmt, clippy) are working
The DataFusion workspace compiles cleanly with the new Rust version
No warnings or errors detected

Are these changes tested?

Are there any user-facing changes?

[alamb]

Thanks @melroy12 -- I started the CI tests

I suspect this PR will fail at least clippy -- you'll perhaps have to run Clippy and make the changes it suggests (note you can also do clippy --fix which will fix some issues)

[melroy12]

Thanks @melroy12 -- I started the CI tests

I suspect this PR will fail at least clippy -- you'll perhaps have to run Clippy and make the changes it suggests (note you can also do clippy --fix which will fix some issues)

I did check before pushing the code , I couldn't find any warnings @alamb

[alamb]

Thanks @melroy12 -- I started the CI tests
I suspect this PR will fail at least clippy -- you'll perhaps have to run Clippy and make the changes it suggests (note you can also do clippy --fix which will fix some issues)

I did check before pushing the code , I couldn't find any warnings @alamb

Looks like we have already addressed the clippy errors in previous PRs. Thank you @melroy12 and @Dandandan