Bump version to v1.3.0

[ChrisRackauckas-Claude]

Version Bump

Bumping version from 1.2.0 to 1.3.0 to prepare for release.

Changes since last release (25 commits)

• Fix ifelse support and update ModelingToolkit compat (Fix ifelse support and update ModelingToolkit compat #54)
• Migration to Dependabot (Add Julia ecosystem to Dependabot configuration #52)
• Bump actions/checkout from 5 to 6 (Bump actions/checkout from 5 to 6 #51)
• Bump crate-ci/typos from 1.18.0 to 1.35.3 (Bump crate-ci/typos from 1.18.0 to 1.35.3 #44)
• Bump actions/checkout from 4 to 5 (Bump actions/checkout from 4 to 5 #45)
• Apply JuliaFormatter to fix code formatting (Apply JuliaFormatter to fix code formatting #42)
• Add downgrade CI workflow (Add downgrade CI workflow #41)
• Add .typos.toml configuration + SpellCheck.yml workflow (Add spell checking configuration #40)
• Update invalidations workflow to use centralised reusable workflow (ci: standardise workflows using SciML's reusable workflows #39)
• Change typeof(x) <: y to x isa y (Change typeof(x) <: y to x isa y #38)
• Bump actions/checkout from 3 to 4 (Bump actions/checkout from 3 to 4 #37)

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