Modernize Python type hints and string formatting

[cclauss]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. Your commit message should include this information as well.

Fixes # (issue)

Checklist:

• [ ] I have added the relevant tests for this change.
• [ ] I have added an item to the Pending section of docs/changes.rst.

Fixed 19 errors:

• debug_toolbar/utils.py: 11 × UP006 (non-pep585-annotation) 5 × UP007 (non-pep604-annotation)
• tests/test_csp_rendering.py: 3 × UP006 (non-pep585-annotation)

Fixed 25 errors:

• debug_toolbar/panels/profiling.py: 1 × UP031 (printf-string-formatting) 1 × UP032 (f-string)
• debug_toolbar/panels/sql/forms.py: 1 × UP031 (printf-string-formatting) 1 × UP032 (f-string)
• debug_toolbar/panels/versions.py: 1 × UP031 (printf-string-formatting) 1 × UP032 (f-string)
• debug_toolbar/toolbar.py: 1 × UP031 (printf-string-formatting)
• debug_toolbar/views.py: 1 × UP031 (printf-string-formatting) 1 × UP032 (f-string)
• tests/base.py: 2 × UP031 (printf-string-formatting) 2 × UP032 (f-string)
• tests/test_csp_rendering.py: 2 × UP031 (printf-string-formatting) 2 × UP032 (f-string)
• tests/test_integration.py: 2 × UP031 (printf-string-formatting) 2 × UP032 (f-string)
• tests/test_integration_async.py: 2 × UP031 (printf-string-formatting) 2 × UP032 (f-string)

[matthiask]

Thanks!