v0.91.1

This is a bug-fix release with a couple of important fixes.

• media: Also consider extension in FromContent 6779117 @bep
• media: Add missing BMP and GIF to the default MediaTypes list ce04011 @bep
• media: Add PDF MIME type cdc7352 @bep
• deps: Update github.com/evanw/esbuild v0.14.5 => v0.14.7 425c7d9 @bep
• config/security: Add HOME to default exec env var whitelist fca266e @bep #9309
• modules: Set GOCACHE env var 0016e21 @bep #9309