Merge branch 'main' into ceh_numgrad

Push Version to 6.6.1

Signed-off-by: MtoLStoN <[email protected]>

Update workflows to meson 0.62.0 (grimme-lab#768)

Signed-off-by: MtoLStoN <[email protected]>

Release version 6.5.1 (grimme-lab#662)

Bump to version 6.5.0 (grimme-lab#618)

Fix gridfile keyword (grimme-lab#489)

Bump program version to 6.4.0 (grimme-lab#428)

Guard time estimate printout in hessian with omp critical (grimme-lab…

…#350)

Bump version number to 6.3.2 (grimme-lab#291)

Bump xtb version number to 6.3.1 (grimme-lab#254)