Bump shellexpand from 2.1.0 to 2.1.2 in /packer (#3976)

Summary:
Bumps [shellexpand](https://gitlab.com/ijackson/rust-shellexpand) from 2.1.0 to 2.1.2.
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://gitlab.com/ijackson/rust-shellexpand/commits/shellexpand/2.1.2">compare view</a></li>
</ul>
</details>
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Pull Request resolved: https://github.com/facebook/flipper/pull/3976

Reviewed By: passy

Differential Revision: D38781372

Pulled By: mweststrate

fbshipit-source-id: d4e3c87f666fc351748bc4ad8fa72c06760e6cb8

packer/Cargo.lock

@@ -203,20 +203,19 @@ dependencies = [
 ]
 
 [[package]]
-name = "dirs-next"
+name = "dirs"
-version = "2.0.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
+checksum = "ca3aa72a6f96ea37bbc5aa912f6788242832f75369bdfdadcb0e38423f100059"
 dependencies = [
- "cfg-if",
+ "dirs-sys",
- "dirs-sys-next",
 ]
 
 [[package]]
-name = "dirs-sys-next"
+name = "dirs-sys"
-version = "0.1.2"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
+checksum = "1b1d1d91c932ef41c0f2663aa8b0ca0342d444d842c06914aa0a7e352d0bada6"
 dependencies = [
  "libc",
  "redox_users",
@@ -688,11 +687,11 @@ dependencies = [
 
 [[package]]
 name = "shellexpand"
-version = "2.1.0"
+version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83bdb7831b2d85ddf4a7b148aa19d0587eddbe8671a436b7bd1182eaad0f2829"
+checksum = "7ccc8076840c4da029af4f87e4e8daeb0fca6b87bbb02e10cb60b791450e11e4"
 dependencies = [
- "dirs-next",
+ "dirs",
 ]
 
 [[package]]