The ornamental design for a beveragecontainerholder, as shown and described.
FIG. 1 is a top perspective view of a beverage container holder showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is another top perspective view thereof; and,
FIG. 8 is a rear perspective view thereof.
The broken lines in FIGS. 7 and 8 of the beverage container holder are for the purpose of illustrating environment, and form no part of the claimed design.