Raise MSRV to 1.64

This is a ~6 month increase from the previous 1.60.

.github/workflows/ci.yaml

@@ -117,7 +117,7 @@ jobs:
 
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: "1.60.0"
+          toolchain: "1.64.0"
           components: clippy
 
       - uses: actions/cache@v4
@@ -129,11 +129,11 @@ jobs:
           key: $clippy-cache-${{ steps.toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Generate lockfile
-      # XXX: `0.6.1` of `toml_datetime` is the last version with a MSRV that matches
-      # our current one. 
+      # XXX: Downgrade various dependencies to make them or their sub-dependencies MSRV compatible.
         run: |
           cargo generate-lockfile
-          cargo update -p toml_datetime --precise "0.6.1"
+          cargo update -p proc-macro-crate --precise "1.3.0"
+          cargo update -p regex --precise "1.9.6"
 
       - name: Clippy MSRV
         run: cargo clippy --features=rt-tokio-crypto-rust --all-targets --all -- -D clippy::dbg_macro -D warnings -F unused_must_use

CHANGELOG.md

@@ -1,4 +1,5 @@
 Unreleased
+- Bumped MSRV to 1.64
 
 [3.0.1]
 - Fix docs.rs builds

Cargo.toml

@@ -9,7 +9,7 @@ name = "secret-service"
 repository = "https://github.com/hwchen/secret-service-rs.git"
 edition = "2021"
 version = "3.0.1"
-rust-version = "1.60.0"
+rust-version = "1.64.0"
 
 # The async runtime features mirror those of `zbus` for compatibility.
 [features]