exercism-fortran

Bump actions/checkout from 6.0.2 to 6.0.3 (#287)

Format all `instructions.append.md` to start with an H1 (required but ignored) and H2 (#286)

Bump cmake min version everywhere from 3.5.0 to 3.31.6 (#285)

[protein-translation] Fix an off-by-one in the example (#284)

Bump actions/checkout from 6.0.1 to 6.0.2 (#281)