Security: Add timeouts to all HTTP requests

[Macktireh]

This PR adds timeout configuration to all HTTP requests to prevent indefinite blocking and potential DoS vulnerabilities. Without timeouts, the application could hang indefinitely if the OAuth provider is slow or unresponsive.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/simplesocialauthlib
__init__.py	0	0	100%
abstract.py	37	3	92%	73, 89, 105
exceptions.py	14	0	100%
types.py	15	0	100%
utils.py	24	14	42%	26–39
src/simplesocialauthlib/providers
__init__.py	21	11	48%	7–8, 14–15, 19–25, 29–30, 34–35
github.py	43	13	70%	59–76, 81–89
google.py	48	15	69%	72–86, 91–112
TOTAL	202	56	72%

Tests	Skipped	Failures	Errors	Time
11	0 💤	0 ❌	0 🔥	1.105s ⏱️