Update dependency dict2xml to v1.7.7 (#8)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [dict2xml](https://redirect.github.com/delfick/python-dict2xml) |
`==1.7.6` -> `==1.7.7` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/dict2xml/1.7.7?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/dict2xml/1.7.6/1.7.7?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>delfick/python-dict2xml (dict2xml)</summary>

###
[`v1.7.7`](https://redirect.github.com/delfick/python-dict2xml/compare/release-1.7.6...release-1.7.7)

[Compare
Source](https://redirect.github.com/delfick/python-dict2xml/compare/release-1.7.6...release-1.7.7)

</details>

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requirements.txt

@@ -1 +1 @@
-dict2xml==1.7.6
+dict2xml==1.7.7