feat(discord): add SetClient and DefaultSession for advanced configur…

…ation (#993)

Adds SetClient() and DefaultSession() methods to allow users to configure
custom Discord sessions without importing discordgo. This enables advanced
use cases such as proxy configuration, custom HTTP clients, and fine-grained
session control.

- Add DefaultSession() to get a session with Discord defaults
- Add SetClient() to set a custom session
- Modify authenticate() to preserve custom session configuration
- Add comprehensive tests covering all workflows
- Add README with usage examples

Fixes #684

chore(deps): update all dependencies to latest versions (#979)

Updated all dependencies to their latest versions to address multiple
outstanding Renovate PRs and security updates.

Major updates include:
- AWS SDK v2: v1.36.1 → v1.41.0 (and related services)
- Firebase Admin SDK: v4.15.1 → v4.18.0
- Google Cloud libraries and APIs
- Discord: v0.28.1 → v0.29.0
- Slack: v0.16.0 → v0.17.3
- Matrix (mautrix): v0.23.0 → v0.26.0
- Various other service SDK updates

Notable changes:
- Upgraded Go toolchain to 1.24.0
- Resolved gRPC stats/opentelemetry module conflict
- Kept textmagic at v2.0.23575 (latest v2.0.43822 has build errors)

Closes: #957, #956, #959, #960, #964, #968, #969, #977

Note: Pre-existing webpush test failures remain (also fail on main).

Allows to set custom properties on a teams client (#927)

Co-authored-by: Niko Köser <[email protected]>

feat(service): PagerDuty service integration (#933)

Co-authored-by: Niko Köser <[email protected]>

Sendgrid: Allow to specify the content type (#871)

Co-authored-by: Niko Köser <[email protected]>

refactor(msteams): fix depreated parts in msteams service (#853)

chore(deps): update and tidy Go dependencies (#875)

fix(notify)!: resolve test & linter issues and fix dependencies compa…

…tibility (#847)

fix(deps): update all dependencies