Upgrade build-fs-tree dependency to ^0.6.0.

This change also bumps the MSRV to `1.64.0`, which is necessary for
transient dependencies (e.g., `serde_yaml`).

.github/workflows/continuous-integration.yml

@@ -44,7 +44,7 @@ jobs:
       matrix:
         os: [macOS-latest, ubuntu-latest, windows-latest]
         toolchain:
-          - 1.63.0 # Minimum.
+          - 1.64.0 # Minimum.
           - stable
           - beta
           - nightly

Cargo.toml

@@ -6,7 +6,7 @@ description = "Opinionated and portable globs that can be matched against paths
 repository = "https://github.com/olson-sean-k/wax"
 readme = "README.md"
 edition = "2021"
-rust-version = "1.63.0"
+rust-version = "1.64.0"
 license = "MIT"
 keywords = [
     "glob",
@@ -62,6 +62,6 @@ version = "^2.4.0"
 optional = true
 
 [dev-dependencies]
-build-fs-tree = "^0.3.0"
+build-fs-tree = "^0.6.0"
 dunce = "^1.0.0"
 tempfile = "^3.2.0"