build: increase MSRV to 1.82.0

This allows using Option::is_none_or()
which is only available since 1.82.0.

Author: link2xt

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ env:
   RUST_VERSION: 1.86.0
 
   # Minimum Supported Rust Version
-  MSRV: 1.81.0
+  MSRV: 1.82.0
 
 jobs:
   lint_rust:

Cargo.toml

@@ -3,7 +3,7 @@ name = "deltachat"
 version = "1.159.0"
 edition = "2021"
 license = "MPL-2.0"
-rust-version = "1.81"
+rust-version = "1.82"
 repository = "https://github.com/chatmail/core"
 
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