build: upgrade to rust v1.86.0

[gvozdvmozgu]

No description provided.

[Wodann]

Thanks for doing the upgrade. A couple of questions about your proposed fixes

[Copilot]

Pull Request Overview

This PR updates the codebase to remove the obsolete Upcast trait usage and the mun_db dependency in favor of direct database references, in line with the Rust 1.86.0 bump. Key changes include:

• Replacing calls to db.upcast() with passing db directly.
• Removing the mun_db crate (and its Cargo.toml entries and implementations) from the project.
• Updating a size calculation to use the new .div_ceil() method.

Reviewed Changes

Copilot reviewed 57 out of 57 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/mun_hir/src/code_model/function.rs	Replaced all db.upcast() calls with direct db usage.
crates/mun_hir/src/code_model.rs	Updated struct data retrieval to use db directly.
crates/mun_hir/Cargo.toml	Removed the mun_db dependency.
crates/mun_db/src/lib.rs & Cargo.toml	Entirely removed mun_db and its Upcast trait implementation.
crates/mun_compiler/src/driver.rs & db.rs	Removed db.upcast() calls and Upcast implementations.
crates/mun_compiler/Cargo.toml	Removed dependency on mun_db.
crates/mun_codegen/*	Updated all relevant modules to stop using db.upcast() and to use db directly.
crates/mun_abi/src/type_info.rs	Updated size calculation using .div_ceil().

Comments suppressed due to low confidence (1)

crates/mun_abi/src/type_info.rs:111

• Typo in error message: 'covert' should be corrected to 'convert'.

.expect("cannot covert size in bytes to platform size")

[Wodann]

Thanks for making those changes! 🙏

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 87.88%. Comparing base (d43f596) to head (4c13594).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/mun_hir/src/code_model/impl.rs	0.00%	2 Missing ⚠️
crates/mun_hir/src/semantics.rs	33.33%	2 Missing ⚠️
crates/mun_hir/src/code_model.rs	0.00%	1 Missing ⚠️
crates/mun_hir/src/code_model/function.rs	83.33%	1 Missing ⚠️
crates/mun_hir/src/code_model/type_alias.rs	90.00%	1 Missing ⚠️
crates/mun_hir/src/method_resolution.rs	85.71%	1 Missing ⚠️
crates/mun_hir/src/package_defs/collector.rs	95.45%	1 Missing ⚠️
crates/mun_syntax/src/ast/tokens.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #584      +/-   ##
==========================================
+ Coverage   87.62%   87.88%   +0.25%     
==========================================
  Files         275      275              
  Lines       32228    32193      -35     
==========================================
+ Hits        28239    28292      +53     
+ Misses       3989     3901      -88     

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