Update dependency com_github_xtensor_xtl to v0.7.7 (#469)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [com_github_xtensor_xtl](https://togithub.com/xtensor-stack/xtl) |
http_archive | patch | `0.7.3` -> `0.7.7` |

---

### Release Notes

<details>
<summary>xtensor-stack/xtl (com_github_xtensor_xtl)</summary>

###
[`v0.7.7`](https://togithub.com/xtensor-stack/xtl/compare/0.7.6...0.7.7)

[Compare
Source](https://togithub.com/xtensor-stack/xtl/compare/0.7.6...0.7.7)

###
[`v0.7.6`](https://togithub.com/xtensor-stack/xtl/compare/0.7.5...0.7.6)

[Compare
Source](https://togithub.com/xtensor-stack/xtl/compare/0.7.5...0.7.6)

###
[`v0.7.5`](https://togithub.com/xtensor-stack/xtl/compare/0.7.4...0.7.5)

[Compare
Source](https://togithub.com/xtensor-stack/xtl/compare/0.7.4...0.7.5)

###
[`v0.7.4`](https://togithub.com/xtensor-stack/xtl/compare/0.7.3...0.7.4)

[Compare
Source](https://togithub.com/xtensor-stack/xtl/compare/0.7.3...0.7.4)

</details>

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bazel/repositories.bzl

@@ -130,12 +130,12 @@ def _com_github_xtensor_xtl():
     maybe(
         http_archive,
         name = "com_github_xtensor_xtl",
-        sha256 = "f4a81e3c9ca9ddb42bd4373967d4859ecfdca1aba60b9fa6ced6c84d8b9824ff",
-        strip_prefix = "xtl-0.7.3",
+        sha256 = "44fb99fbf5e56af5c43619fc8c29aa58e5fad18f3ba6e7d9c55c111b62df1fbb",
+        strip_prefix = "xtl-0.7.7",
         build_file = "@spulib//bazel:xtl.BUILD",
         type = "tar.gz",
         urls = [
-            "https://github.com/xtensor-stack/xtl/archive/refs/tags/0.7.3.tar.gz",
+            "https://github.com/xtensor-stack/xtl/archive/refs/tags/0.7.7.tar.gz",
         ],
     )