Update Python dependencies (major) (#165)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [tenacity](https://redirect.github.com/jd/tenacity) | `^8.5.0` ->
`^9.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/tenacity/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/tenacity/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/tenacity/8.5.0/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/tenacity/8.5.0/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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poetry.lock

@@ -9,8 +9,8 @@ requires-poetry = ">=2.0.0"
 python = "^3.8.6"  # ^3.8.6 required by juju
 # breaking change in ops 2.10.0: https://github.com/canonical/operator/pull/1091#issuecomment-1888644075
 ops = "^2.9.0, <2.10"
-tenacity = "^8.5.0"
-poetry-core = "^1.9.0"
+tenacity = "^9.0.0"
+poetry-core = "^1.9.1"
 jinja2 = "^3.1.4"
 requests = "^2.32.3"
 
@@ -51,7 +51,7 @@ pytest = "^8.2.2"
 pytest-operator = "^0.35.0"
 juju = "^3.6.0.0"
 mysql-connector-python = "~8.0.33"
-tenacity = "^8.5.0"
+tenacity = "^9.0.0"
 ops = "^2.9.0"
 allure-pytest-default-results = "^0.1.2"