Bump MSRV to 1.41.1.

[TheBlueMatt]

1.41.1 is currently the Firefox ESR MSRV, which means its also the
version several Linux distros ship. Further, rust-bitcoin is likely
to make a similar change soon, see
rust-bitcoin/rust-bitcoin#510.

Lets wait until 106 for this.

[codecov-commenter]

Codecov Report

Merging #1310 (9f277dc) into main (963f8d9) will increase coverage by 0.39%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1310      +/-   ##
==========================================
+ Coverage   90.51%   90.90%   +0.39%     
==========================================
  Files          71       72       +1     
  Lines       39210    41970    +2760     
==========================================
+ Hits        35490    38154    +2664     
- Misses       3720     3816      +96     

Impacted Files	Coverage Δ
lightning/src/util/scid_utils.rs	98.58% <0.00%> (-1.42%)	⬇️
lightning/src/ln/functional_tests.rs	97.07% <0.00%> (-0.04%)	⬇️
lightning/src/util/crypto.rs	100.00% <0.00%> (ø)
lightning/src/routing/router.rs	91.92% <0.00%> (+0.12%)	⬆️
lightning-invoice/src/de.rs	81.27% <0.00%> (+0.20%)	⬆️
lightning/src/chain/keysinterface.rs	96.15% <0.00%> (+0.29%)	⬆️
lightning/src/ln/onion_utils.rs	96.05% <0.00%> (+0.41%)	⬆️
lightning-invoice/src/lib.rs	88.24% <0.00%> (+0.82%)	⬆️
lightning/src/util/test_utils.rs	83.78% <0.00%> (+1.52%)	⬆️
lightning/src/ln/functional_test_utils.rs	97.27% <0.00%> (+2.04%)	⬆️
... and 3 more

---

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[valentinewallace]

CI seems confused 🤔 it's waiting on checks from the deprecated-as-of-this-PR Rust versions. I'm guessing it'd go away after merge but just wanted to note.

[TheBlueMatt]

CI seems confused thinking it's waiting on checks from the deprecated-as-of-this-PR Rust versions. I'm guessing it'd go away after merge but just wanted to note.

Oh, thanks, yea, will have to disable those checks as "required" in the repo config.