chore: add MSRV 1.82

Fixes the error:

```
   Compiling idna v1.0.3
error[E0658]: use of unstable library feature 'error_in_core'
  --> /home/ubuntu/.cargo/registry/src/index.crates.io-6f17d22bba15001f/idna-1.0.3/src/lib.rs:78:6
   |
78 | impl core::error::Error for Errors {}
   |      ^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #103765 <rust-lang/rust#103765> for more information
```

Author: astralblue

block-builder/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-block-builder"
 description = "OpenRank - Block Builder Node"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true

common/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-common"
 description = "Common library for OpenRank codebase"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true

computer/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-computer"
 description = "OpenRank - Computer Node"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true

da/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-da"
 description = "DA wrapper for OpenRank codebase"
+rust-version = "1.82"
 license = "MIT"
 version.workspace = true
 authors.workspace = true

openrank-sdk/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-sdk"
 description = "OpenRank - SDK"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true

relayer/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-relayer"
 description = "OpenRank - Relayer"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true

sequencer/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-sequencer"
 description = "OpenRank - Sequencer Node"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true

verifier/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "openrank-verifier"
 description = "OpenRank - Verifier Node"
+rust-version = "1.82"
 license.workspace = true
 version.workspace = true
 authors.workspace = true