Add gersemi@0.25

[PatTheMav]

Description

Adds version-pinned formula for gersemi.

Motivation and Context

As gersemi exists as a core Homebrew formula for some time now, the local Formula used by this repository creates a naming collision.

To resolve this collision (and also ensure that local CI installations of obs-studio do not encounter sudden updates (and thus behavioural changes) of the formatter, a version-pinned variant can be used instead.

How Has This Been Tested?

Tests will be done by CI.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.