Bump MSRV to 1.36

[TheBlueMatt]

cc rust-bitcoin/rust-bitcoin#510 but basically I'm too lazy to actually fix CI and instead just figure we can go ahead and take the MSRV bump (though I'll dig if CI fails here too).

[codecov]

Codecov Report

Merging #897 (5625c3a) into main (36570f4) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #897      +/-   ##
==========================================
+ Coverage   90.29%   90.40%   +0.11%     
==========================================
  Files          57       57              
  Lines       29268    30010     +742     
==========================================
+ Hits        26427    27131     +704     
- Misses       2841     2879      +38     

Impacted Files	Coverage Δ
lightning-invoice/src/de.rs	81.33% <0.00%> (-0.02%)	⬇️
lightning/src/ln/features.rs	98.92% <0.00%> (+<0.01%)	⬆️
lightning/src/ln/functional_tests.rs	96.85% <0.00%> (+0.03%)	⬆️
lightning-invoice/src/lib.rs	87.40% <0.00%> (+3.04%)	⬆️
lightning-invoice/src/ser.rs	91.75% <0.00%> (+7.98%)	⬆️

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[ariard]

ACK df91e67

[TheBlueMatt]

Full diff is only comments. Will merge after CI.

$ git diff-tree -U1 df91e675e 5625c3ab5
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6fcfc7379..341d3819f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,5 +11,5 @@ jobs:
                      beta,
-                     # 1.36.0 is MSRV for Rust-Lightning
+                     # 1.36.0 is MSRV for Rust-Lightning, lightning-invoice, and lightning-persister
                      1.36.0,
-                     # 1.34.2 is Debian stable
+                     # 1.41.0 is Debian stable
                      1.41.0,