Bump MSRV and reqwest dependency

[tnull]

We bump the MSRV to 1.75.0 as most of our HTTP dependencies already require this, and we already require it for lightning-transaction-sync / LDK Node.

As we can do this then, we bump the reqwest dependency to 0.12 (which is nice as most other projects have by now, allowing us to not keep multiple versions in the tree).

[ldk-reviews-bot]

👋 Thanks for assigning @tankyleo as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[tankyleo]

Thank you ! Do we want RUSTFLAGS=--cfg=genproto cargo +1.75.0 build to work ? Otherwise LGTM

[tnull]

Thank you ! Do we want RUSTFLAGS=--cfg=genproto cargo +1.75.0 build to work ? Otherwise LGTM

Hmm, not sure tbh? Do you think we should? Also, should we add a CI that runs genproto and checks the output is up-to-date, i.e., requiring any PRs going forward to update the types.rs as we go, similar to running rustfmt?

[tankyleo]

Hmm, not sure tbh? Do you think we should?

Upon further thought, I don't think it's necessary since this is a developer command; first update API definition, then update src/types.rs.

Also, should we add a CI that runs genproto and checks the output is up-to-date, i.e., requiring any PRs going forward to update the types.rs as we go, similar to running rustfmt?

Certainly yes - I'll take care of this in a follow-up thank you.