feat: associate unzip and friends with *.vsix

These are VS Code extension files,
https://code.visualstudio.com/docs/editor/extension-marketplace#_install-from-a-vsix

bash_completion

@@ -3056,7 +3056,7 @@ _comp__init_install_xspec()
 }
 # bzcmp, bzdiff, bz*grep, bzless, bzmore intentionally not here, see Debian: #455510
 _comp__init_install_xspec '!*.?(t)bz?(2)' bunzip2 bzcat pbunzip2 pbzcat lbunzip2 lbzcat
-_comp__init_install_xspec '!*.@(zip|[aegjkswx]ar|exe|pk3|wsz|zargo|xpi|s[tx][cdiw]|sx[gm]|o[dt][tspgfc]|od[bm]|oxt|?(o)xps|epub|cbz|apk|aab|ipa|do[ct][xm]|p[op]t[mx]|xl[st][xm]|pyz|whl|[Ff][Cc][Ss]td)' unzip zipinfo
+_comp__init_install_xspec '!*.@(zip|[aegjkswx]ar|exe|pk3|wsz|zargo|xpi|s[tx][cdiw]|sx[gm]|o[dt][tspgfc]|od[bm]|oxt|?(o)xps|epub|cbz|apk|aab|ipa|do[ct][xm]|p[op]t[mx]|xl[st][xm]|pyz|vsix|whl|[Ff][Cc][Ss]td)' unzip zipinfo
 _comp__init_install_xspec '*.Z' compress znew
 # zcmp, zdiff, z*grep, zless, zmore intentionally not here, see Debian: #455510
 _comp__init_install_xspec '!*.@(Z|[gGd]z|t[ag]z)' gunzip zcat