v6.0.0 release

## [6.0.0] - 2023-08-30
Fixed several major typos and fortran array ordering issues in tkfram, zzdynrot as well as failing tests on arm64 macos. 
### Added
- SpiceNOTENOUGHDATA2 exception #466
- Context manager for SPICE kernels #458
- CITATION.cff file
- DeprecationWarning for zzdynrot

### Changed
- tkfram_c now used in tkfram wrapper function
- updated setup.cfg
- type hints for sincpt to be more correct

### Deprecated
- python 3.6
- python 3.7

### Removed
- codecov as a dependency in dev

### Fixed
- fixed zzdynrot and tkfram return matrix element ordering
- typo in exceptions.rst #459
- fixed test test_sphlat
- fixed sphlat to use correct libspice function call
- fixed tests for dskx02, dskxsi, gfsntc for arm64 macos floating point issues #470
- fixed typo in test_oscelt and test_oscltx

fix for exception error message toolkit version

- exceptions now use dynamic lookup of toolkit version for error messages

fix date for release

SpiceyPy 5.1.0

* adds wrappers for the majority of new function in n67

minor update to make ld_library_path update safer

spiceypy 5.0.0 (#440)

fixes long description issue, adds twine check calls to publish workf…

…lows

release of version 4.0.2

SpiceyPy v4.0.1

Added
- docs info about ARM support, currently limited to conda-forge spiceypy
- docs citation info/basic intro
- hash checksums for test kernels
- offline install ci tests
- warn_deprecated_args function to aid future deprecations

Deprecated
- added deprecation warnings for ncol/nrow params for: mtxmg, mtxvg,
mxm, mxmg, mxmt, mxmtg, mxvg, vtmvg, xposeg pending next major release.
- added deprecation warnings for ndim param for: unormg, vaddg, vdistg,
vdotg, vequg, vhatg, vminug, vnromg, vrelg, vsclg, vsepg, vsubg, vzerog
pending next major release.

Changed
- copyright year
- a number of typehints to accept np.ndarray
- changed test_wrapper to use a pytest autouse fixture to call
reset/kclear automatically for most tests

Fixed
- missing docs for xf2eul
- numpy bool_ deprecation warnings
- numpy float warning
- type hint for appndd

SpiceyPy v4.0.0

Added
- bodeul
Changed
- main branch is now the default branch
- switched to use 'fromisoformat' in datetime2et
Fixed
- fixed nintvls spelling inconsistency