ci: Bump Python version for linting (#4897)

### Description
Python 3.14 is out, let's use it for linting.

#### Issues
Ref #4895

#### Reminders
- Please add tests to validate your changes, and lint your code using
`tox -e linters`.
- Add GH Issue ID _&_ Linear ID (if applicable)
- PR title should use [conventional
commit](https://develop.sentry.dev/engineering-practices/commit-messages/#type)
style (`feat:`, `fix:`, `ref:`, `meta:`)
- For external contributors:
[CONTRIBUTING.md](https://github.com/getsentry/sentry-python/blob/master/CONTRIBUTING.md),
[Sentry SDK development docs](https://develop.sentry.dev/sdk/), [Discord
community](https://discord.gg/Ww9hbqr)

Author: sentrivana

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/[email protected]
       - uses: actions/setup-python@v6
         with:
-          python-version: 3.12
+          python-version: 3.14
 
       - run: |
           pip install tox

scripts/populate_tox/tox.jinja

@@ -181,7 +181,7 @@ basepython =
     # Python version is pinned here for consistency across environments.
     # Tools like ruff and mypy have options that pin the target Python
     # version (configured in pyproject.toml), ensuring consistent behavior.
-    linters: python3.12
+    linters: python3.14
 
 commands =
     {py3.7,py3.8}-boto3: pip install urllib3<2.0.0

tox.ini

@@ -812,7 +812,7 @@ basepython =
     # Python version is pinned here for consistency across environments.
     # Tools like ruff and mypy have options that pin the target Python
     # version (configured in pyproject.toml), ensuring consistent behavior.
-    linters: python3.12
+    linters: python3.14
 
 commands =
     {py3.7,py3.8}-boto3: pip install urllib3<2.0.0