office-ui-fabric-react v6.152.0

Minor changes

• BaseButton does not call onAfterMenuDismiss when persistMenu is true (commit by ddlbrena, pr #8191)
• Change FocusZone to use the as pattern (commit by aneeshack4, pr #8157)

Patches

• Tooltip: Add absolute position example to documentation (commit by leddie24, pr #8196)
• FocusZone: removing dependency on BaseComponent, slicing about 3k gzipped off the payload. (commit by dzearing, pr #8169)