Bump osm-static-maps from `b831ced` to `bb264d0`

Bumps osm-static-maps from b831ced to bb264d0.

Commits

• bb264d0 fix vector map labels opacity
• 1460e0f Fix vectorserverUrl not returning image
• 34b9b41 release v4.0.0
• c375880 prefer faster oxipng compression
• b2a2fcf upgrade all dependencies
• 5ea748d fix imagemin missing optipng binary
• ce65463 upgrade commonjs to nodejs modules
• See full diff in compare view

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