Bump indoc from 1.0.3 to 1.0.6

Bumps [indoc](https://github.com/dtolnay/indoc) from 1.0.3 to 1.0.6.
- [Release notes](https://github.com/dtolnay/indoc/releases)
- [Commits](https://github.com/dtolnay/indoc/compare/1.0.3...1.0.6)

---
updated-dependencies:
- dependency-name: indoc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -486,12 +486,9 @@ dependencies = [
 
 [[package]]
 name = "indoc"
-version = "1.0.3"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5a75aeaaef0ce18b58056d306c27b07436fbb34b8816c53094b76dd81803136"
-dependencies = [
- "unindent",
-]
+checksum = "05a0bd019339e5d968b37855180087b7b9d512c5046fbd244cf8c95687927d6e"
 
 [[package]]
 name = "instant"
@@ -986,12 +983,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
-[[package]]
-name = "unindent"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"
-
 [[package]]
 name = "version_check"
 version = "0.9.4"