upgrade MSRV from 1.85 to 1.87 (#1655)

## Which issue does this PR close?


- Closes #.

## What changes are included in this PR?

MSRV policy,
https://github.com/apache/iceberg-rust?tab=readme-ov-file#supported-rust-version

Rust release
- [1.86](https://releases.rs/docs/1.86.0/), Released on: 3 April, 2025
- [1.87](https://releases.rs/docs/1.87.0/), Released on: 15 May, 2025
- [1.88](https://releases.rs/docs/1.88.0/), Released on: 26 June, 2025

We can bump MSRV to 1.87

Last MSRV update was [4 months
ago](https://github.com/apache/iceberg-rust/blame/7362bbdcf72910d95ee88940f229d2eea40b3fa1/Cargo.toml#L38-L39)
for the 0.5.0 release


## Are these changes tested?

Author: kevinjqliu

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  rust_msrv: "1.85.0"
+  rust_msrv: "1.87"
 
 jobs:
   check:

.github/workflows/publish.yml

@@ -27,7 +27,7 @@ on:
   workflow_dispatch:
 
 env:
-  rust_msrv: "1.85"
+  rust_msrv: "1.87"
 
 jobs:
   publish:

.github/workflows/release_python.yml

@@ -25,7 +25,7 @@ on:
   workflow_dispatch:
 
 env:
-  rust_msrv: "1.85"
+  rust_msrv: "1.87"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.workflow_run.head_branch }}-${{ github.event_name }}

.github/workflows/release_python_nightly.yml

@@ -23,7 +23,7 @@ on:
   workflow_dispatch: # Allows manual triggering
 
 env:
-  rust_msrv: "1.85"
+  rust_msrv: "1.87"
 
 permissions:
   contents: read

Cargo.toml

@@ -36,7 +36,7 @@ version = "0.6.0"
 license = "Apache-2.0"
 repository = "https://github.com/apache/iceberg-rust"
 # Check the MSRV policy in README.md before changing this
-rust-version = "1.85"
+rust-version = "1.87"
 
 [workspace.dependencies]
 anyhow = "1.0.72"

bindings/python/Cargo.toml

@@ -19,7 +19,7 @@
 edition = "2024"
 homepage = "https://rust.iceberg.apache.org"
 name = "pyiceberg_core_rust"
-rust-version = "1.85"
+rust-version = "1.87"
 version = "0.6.0"
 # This crate is used to build python bindings, we don't want to publish it
 publish = false