Use webp for avatar storage (ccgo variant)

This PR uses the git.sr.ht/~jackmordaunt/go-libwebp package to encode
avatars as webp.

Ref go-gitea#24263
Close go-gitea#24642

Signed-off-by: Andrew Thornton <[email protected]>

Author: zeripath

assets/go-licenses.json

@@ -7,6 +7,7 @@ require (
 	code.gitea.io/gitea-vet v0.2.2
 	code.gitea.io/sdk/gitea v0.15.1
 	codeberg.org/gusted/mcaptcha v0.0.0-20220723083913-4f3072e1d570
+	git.sr.ht/~jackmordaunt/go-libwebp v0.0.0-20230124063009-3a3b6556d77c
 	gitea.com/go-chi/binding v0.0.0-20230415142243-04b515c6d669
 	gitea.com/go-chi/cache v0.2.0
 	gitea.com/go-chi/captcha v0.0.0-20230415143339-2c0754df4384
@@ -251,6 +252,7 @@ require (
 	github.com/prometheus/client_model v0.3.0 // indirect
 	github.com/prometheus/common v0.42.0 // indirect
 	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20220927061507-ef77025ab5aa // indirect
 	github.com/rhysd/actionlint v1.6.24 // indirect
 	github.com/rivo/uniseg v0.4.4 // indirect
 	github.com/robfig/cron v1.2.0 // indirect
@@ -295,6 +297,9 @@ require (
 	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	modernc.org/libc v1.22.2 // indirect
+	modernc.org/mathutil v1.5.0 // indirect
+	modernc.org/memory v1.5.0 // indirect
 )
 
 replace github.com/hashicorp/go-version => github.com/6543/go-version v1.3.1