build: bump workspace MSRV to 1.88 (#10927)

* build: bump workspace MSRV to 1.88

Raise the workspace (libraries) rust-version from 1.85.1 to 1.88. The
zebrad binary MSRV is unchanged at 1.91.

Now that the workspace MSRV is 1.88, home no longer needs to be pinned to
0.5.11, so update it to 0.5.12 and drop the manual-downgrade step from the
release checklists.

* CHANGELOG: note workspace MSRV bump to 1.88

---------

Co-authored-by: Conrado <conrado@zfnd.org>

Author: dannywillems

.github/ISSUE_TEMPLATE/release.md

@@ -39,7 +39,6 @@ This step can be skipped if there is a large pending dependency upgrade. (For ex
 Here's how we make sure we got everything:
 
 - [ ] Run `cargo update` on the latest `main` branch, and keep the output
-- [ ] Until we bump the workspace MSRV to 1.88 or higher, `home` must be downgraded manually: `cargo update home@0.5.12 --precise 0.5.11`
 - [ ] If needed, [add duplicate dependency exceptions to deny.toml](https://github.com/ZcashFoundation/zebra/blob/main/book/src/dev/continuous-integration.md#fixing-duplicate-dependencies-in-check-denytoml-bans)
 - [ ] If needed, remove resolved duplicate dependencies from `deny.toml`
 - [ ] Open a separate PR with the changes

.github/PULL_REQUEST_TEMPLATE/release-checklist-legacy.md

@@ -25,7 +25,6 @@ This step can be skipped if there is a large pending dependency upgrade. (For ex
 Here's how we make sure we got everything:
 
 - [ ] Run `cargo update` on the latest `main` branch, and keep the output
-- [ ] Until we bump the workspace MSRV to 1.88 or higher, `home` must be downgraded manually: `cargo update home@0.5.12 --precise 0.5.11`
 - [ ] If needed, [add duplicate dependency exceptions to deny.toml](https://github.com/ZcashFoundation/zebra/blob/main/book/src/dev/continuous-integration.md#fixing-duplicate-dependencies-in-check-denytoml-bans)
 - [ ] If needed, remove resolved duplicate dependencies from `deny.toml`
 - [ ] Open a separate PR with the changes

AGENTS.md

@@ -113,7 +113,7 @@ cargo nextest run --profile ci --locked --release --features default-release-bin
 Zebra is a Zcash full node implementation in Rust. It is a validator node — it excludes features not strictly needed for block validation and chain sync.
 
 - **Rust edition**: 2021
-- **MSRV**: 1.85.1 (libraries), 1.91 (zebrad binary)
+- **MSRV**: 1.88 (libraries), 1.91 (zebrad binary)
 - **Database format version**: defined in `zebra-state/src/constants.rs`
 
 ## Crate Architecture

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ## [Unreleased]
 
+### Changed
+
+- Bumped the workspace (libraries) MSRV from 1.85.1 to 1.88. The `zebrad` binary
+  MSRV is unchanged at 1.91. `home` is no longer pinned to 0.5.11, since 0.5.12
+  builds on the new MSRV.
+
 ### Fixed
 
 - Don't disconnect from peers that return empty `FindBlocks` or `FindHeaders`

Cargo.lock

@@ -2119,11 +2119,11 @@ dependencies = [
 
 [[package]]
 name = "home"
-version = "0.5.11"
+version = "0.5.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "589533453244b0995c858700322199b2becb13b627df2851f64a2775d024abcf"
+checksum = "cc627f471c528ff0c4a49e1d5e60450c8f6461dd6d10ba9dcd3a61d3dff7728d"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]

Cargo.toml

@@ -23,7 +23,7 @@ license = "MIT OR Apache-2.0"
 repository = "https://github.com/ZcashFoundation/zebra"
 homepage = "https://zfnd.org/zebra/"
 keywords = ["zebra", "zcash"]
-rust-version = "1.85.1"
+rust-version = "1.88"
 edition = "2021"
 
 # `cargo release` settings