ci: bump actions/setup-python from 5.3.0 to 6.0.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v5.3.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/pre-release.yml

@@ -15,7 +15,7 @@ jobs:
           fetch-depth: 2
 
       - name: Set up Python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: "3.10"
 

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           fetch-depth: 2
       - name: Set up Python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: "3.11"
       - name: Install pip and poetry

.github/workflows/tests.yml

@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: ${{ matrix.python }}
 

src/healthchecks_io/schemas/checks.py

@@ -128,33 +128,33 @@ class CheckCreate(BaseModel):
 
     @field_validator("schedule")
     @classmethod
-    def validate_schedule(cls, value: str | None) -> str:
+    def validate_schedule(cls, value: str) -> str:
         """Validates that the schedule is a valid cron expression."""
-        if value and not croniter.is_valid(value):
+        if not croniter.is_valid(value):
             raise ValueError("Schedule is not a valid cron expression")
         return value
 
     @field_validator("tz")
     @classmethod
-    def validate_tz(cls, value: str | None) -> str:
+    def validate_tz(cls, value: str) -> str:
         """Validates that the timezone is a valid timezone string."""
-        if value and value not in pytz.all_timezones:
+        if value not in pytz.all_timezones:
             raise ValueError("Tz is not a valid timezone")
         return value
 
     @field_validator("methods")
     @classmethod
-    def validate_methods(cls, value: str | None) -> str:
+    def validate_methods(cls, value: str) -> str:
         """Validate that methods."""
-        if value and value != "POST":
-            raise ValueError("Methods is invalid, it should be either an empty string, None, or POST")
-        return ""
+        if value not in ("", "POST"):
+            raise ValueError("Methods is invalid, it should be either an empty string or POST")
+        return value
 
     @field_validator("unique")
     @classmethod
-    def validate_unique(cls, value: List[Optional[str]] | None) -> List[Optional[str]]:
+    def validate_unique(cls, value: List[Optional[str]]) -> List[Optional[str]]:
         """Validate unique list."""
-        for unique in value or []:
+        for unique in value:
             if unique not in ("name", "tags", "timeout", "grace"):
                 raise ValueError(
                     "Unique is not valid. Unique can only be name, tags, timeout, and grace or an empty list"