Bump rust version requirement to 1.82, because dependencies (#557)

This should fix:

```
error: rustc 1.81.0 is not supported by the following packages:
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
  [email protected] requires rustc 1.82
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.81.0
```

Signed-off-by: Thomas Habets <[email protected]>

Author: ThomasHabets

.github/workflows/rust.yml

@@ -9,9 +9,9 @@ on:
 env:
   CARGO_TERM_COLOR: always
   # Pinned toolchain for linting and benchmarks
-  ACTIONS_LINTS_TOOLCHAIN: 1.81.0
+  ACTIONS_LINTS_TOOLCHAIN: 1.82.0
   # Minimum supported Rust version (MSRV)
-  ACTION_MSRV_TOOLCHAIN: 1.81.0
+  ACTION_MSRV_TOOLCHAIN: 1.82.0
   EXTRA_FEATURES: "protobuf push process"
 
 jobs:

Cargo.toml

@@ -9,7 +9,7 @@ license = "Apache-2.0"
 name = "prometheus"
 readme = "README.md"
 repository = "https://github.com/tikv/rust-prometheus"
-rust-version = "1.81"
+rust-version = "1.82"
 version = "0.14.0"
 
 [package.metadata.docs.rs]