fix: add chart version timestamp in the patch slot, without hyphen

[parkedwards]

so it will be:

2024.2.9125019

# instead of

2024.2.9-125019

as the pre-release append is NOT treated as part of the normal versioning sequence:

Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements

[parkedwards]

the %H%M%S will always be 6 digits, so we can back into the "day" piece pretty consistently (6 chars from the right)