chore(deps): update dependency bazel_skylib to v1.0.3 (#722)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [bazel_skylib](https://github.com/bazelbuild/bazel-skylib) | http_archive | patch | `1.0.2` -> `1.0.3` |

---

### Release Notes

<details>
<summary>bazelbuild/bazel-skylib</summary>

### [`v1.0.3`](https://github.com/bazelbuild/bazel-skylib/releases/1.0.3)

[Compare Source](https://github.com/bazelbuild/bazel-skylib/compare/1.0.2...1.0.3)

**New Features**

-   copy_file: Add parameter to allow symlinks ([#&#8203;252](https://github.com/bazelbuild/bazel-skylib/issues/252))
-   Create Gazelle language for Starlark ([#&#8203;251](https://github.com/bazelbuild/bazel-skylib/issues/251))
-   Create a helper rule (`select_file`) for selecting a file from outputs of another rule ([#&#8203;233](https://github.com/bazelbuild/bazel-skylib/issues/233))

**Significant Changes**

-   Move Gazelle extension to //gazelle/bzl and change package name
-   Stop depending on rules_pkg through the federation. ([#&#8203;259](https://github.com/bazelbuild/bazel-skylib/issues/259))

**Incompatible Changes**

-   Remove links to maprules ([#&#8203;213](https://github.com/bazelbuild/bazel-skylib/issues/213))
-   Remove old_sets.bzl ([#&#8203;231](https://github.com/bazelbuild/bazel-skylib/issues/231))
    It has been deprecated for a while, the code is not really compatible with Bazel depset-related changes.

**Contributors**
Andrew Z Allen, Bocete, Bor Kae Hwang, irengrig, Jay Conrod, Jonathan B Coe, Marc Plano-Lesay, Robbert van Ginkel, Thomas Van Lenten, Yannic, and the Bazel team.

**WORKSPACE setup**

```
load("@&#8203;bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
http_archive(
    name = "bazel_skylib",
    urls = [
        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
    ],
    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
)
load("@&#8203;bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
bazel_skylib_workspace()

```

**Using the rules**

See [the source](https://github.com/bazelbuild/bazel-skylib/tree/1.0.3).

</details>

---

### Configuration

📅 **Schedule**: At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻️ **Rebasing**: Renovate will not automatically rebase this PR, because other commits have been found.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box.

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/gapic-generator-java).

WORKSPACE

@@ -8,10 +8,10 @@ load("@bazel_tools//tools/build_defs/repo:jvm.bzl", "jvm_maven_import_external")
 # like protobuf will build.
 http_archive(
     name = "bazel_skylib",
-    sha256 = "97e70364e9249702246c0e9444bccdc4b847bed1eb03c5a3ece4f83dfe6abc44",
+    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.2/bazel-skylib-1.0.2.tar.gz",
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.2/bazel-skylib-1.0.2.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
     ],
 )