Update ghost Docker tag to v21.1.49

This MR contains the following updates:

Package	Update	Change
ghost (source)	patch	21.1.45 -> 21.1.49

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Release Notes

bitnami/charts (ghost)

v21.1.49

• [bitnami/ghost] Release 21.1.49 (#​30313) (a4f246e), closes #​30313

v21.1.48

• [bitnami/ghost] Release 21.1.48 (#​30307) (5a628ec), closes #​30307

v21.1.47

• [bitnami/ghost] Release 21.1.47 (#​30172) (a1c85ed), closes #​30172

v21.1.46

• [bitnami/*] Remove wrong comment about imagePullPolicy (#​30107) (a51f9e4), closes #​30107
• [bitnami/ghost] Release 21.1.46 (#​30150) (65f390b), closes #​30150

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