ref: Drop 3.6 in new major

[sentrivana]

Description

Drop 3.6 from tests, utils, etc.

CI failures should be unrelated (coming from toxgen update, once fixed on master they'll resolve here as well).

Ignore the diff size; it's mostly tox.ini and friends.

Issues

Closes #5040

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 89557 passed | ❌ 1 failed | ⏭️ 5464 skipped | Total: 95022 | Pass Rate: 94.25% | Execution Time: 326m 60s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -6780
Passed Tests	📉 -6006
Failed Tests	📈 +1
Skipped Tests	📉 -775

➕ New Tests (1)

View new tests

• test_continuous_profiler_auto_start_and_stop_sampled_span_streaming[experiment-gevent]
  • File: tests.profiler.test_continuous_profiler
  • Status: ❌ Failing

❌ Failed Tests

test_continuous_profiler_auto_start_and_stop_sampled_span_streaming[experiment-gevent]

File: tests.profiler.test_continuous_profiler
Suite: py3.7-gevent
Error: AssertionError: profiler should not be running assert 'e268ab0827534e3f84f5ffdb46989257' is None + where 'e268ab0827534e3f84f5ffdb46989257' = get_profiler_id()

Stack Trace

tests/profiler/test_continuous_profiler.py:896: in test_continuous_profiler_auto_start_and_stop_sampled_span_streaming
    assert get_profiler_id() is None, "profiler should not be running"
E   AssertionError: profiler should not be running
E   assert 'e268ab0827534e3f84f5ffdb46989257' is None
E    +  where 'e268ab0827534e3f84f5ffdb46989257' = get_profiler_id()

❌ Patch coverage is 43.48%. Project has 2371 uncovered lines.
✅ Project coverage is 90%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/aws_lambda.py	0.00%	⚠️ 13 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.92%    90.00%    +0.08%
==========================================
  Files          193       186        -7
  Lines        24825     23703     -1122
  Branches      8912      8558      -354
==========================================
+ Hits         22321     21332      -989
- Misses        2504      2371      -133
- Partials      1414      1376       -38

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