### ImageMagick version

7.1.1

### Operating system

Linux

### Operating system, version and so on

CentOS Linux release 7.8.2003 (Core)

### Description

I want to be able to change the size of an animated webp. 

### Steps to Reproduce

### install:

```
 yum -y install libwebp-devel libwebp-tools
[root]# yum list installed | grep webp
libwebp.x86_64                         0.3.0-11.el7               @updates
libwebp-devel.x86_64                   0.3.0-11.el7               @updates
libwebp-tools.x86_64                   0.3.0-11.el7               @updates
```
```
source code: https://github.com/ImageMagick/ImageMagick/archive/refs/tags/7.1.1-0.tar.gz
tar -xvf ImageMagick-7.1.1-0.tar.gz
./configure --with-webp --prefix=/usr/local/imagemagick
make
make install
```

#### single webp can be resized:
```
[root]#  /usr/local/imagemagick/bin/convert -resize 480  simple.webp simple_480.webp
Decoded /tmp/magick-LNPdXgk2zDpiuU6Qv9CpDups3560EATh. Dimensions: 2160 x 608. Now saving...
Saved file /tmp/magick-Q8JHRZZOXdp1r1x187eftzsFlw8AqAuo
```

#### but animated webp failed:
```
[root]#  /usr/local/imagemagick/bin/convert -resize 480  b.webp b_480.webp
Error! Decoding of an animated WebP file is not supported.
       Use webpmux to extract the individual frames or
       vwebp to view this image.
Decoding of /tmp/magick-jMiy7ytmAnBzpS8UpafCQ5B44BjDTUSD failed.
Status: 4 (UNSUPPORTED_FEATURE)
convert: delegate failed `'dwebp' -pam '%i' -o '%o'' @ error/delegate.c/InvokeDelegate/1924.
convert: unable to open file '/tmp/magick-D-NMEGWU_a0IypZWwTpYiWIE61nteoig': No such file or directory @ error/constitute.c/ReadImage/786.
convert: no images defined `b_480.webp' @ error/convert.c/ConvertImageCommand/3342.
```

### Images

_No response_
How to resize an animated webp？
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : How to resize an animated webp？
Issue date:

--- start body ---
### ImageMagick version

7.1.1

### Operating system

Linux

### Operating system, version and so on

CentOS Linux release 7.8.2003 (Core)

### Description

I want to be able to change the size of an animated webp. 

### Steps to Reproduce

### install:

```
 yum -y install libwebp-devel libwebp-tools
[root]# yum list installed | grep webp
libwebp.x86_64                         0.3.0-11.el7               @updates
libwebp-devel.x86_64                   0.3.0-11.el7               @updates
libwebp-tools.x86_64                   0.3.0-11.el7               @updates
```
```
source code: https://github.com/ImageMagick/ImageMagick/archive/refs/tags/7.1.1-0.tar.gz
tar -xvf ImageMagick-7.1.1-0.tar.gz
./configure --with-webp --prefix=/usr/local/imagemagick
make
make install
```

#### single webp can be resized:
```
[root]#  /usr/local/imagemagick/bin/convert -resize 480  simple.webp simple_480.webp
Decoded /tmp/magick-LNPdXgk2zDpiuU6Qv9CpDups3560EATh. Dimensions: 2160 x 608. Now saving...
Saved file /tmp/magick-Q8JHRZZOXdp1r1x187eftzsFlw8AqAuo
```

#### but animated webp failed:
```
[root]#  /usr/local/imagemagick/bin/convert -resize 480  b.webp b_480.webp
Error! Decoding of an animated WebP file is not supported.
       Use webpmux to extract the individual frames or
       vwebp to view this image.
Decoding of /tmp/magick-jMiy7ytmAnBzpS8UpafCQ5B44BjDTUSD failed.
Status: 4 (UNSUPPORTED_FEATURE)
convert: delegate failed `'dwebp' -pam '%i' -o '%o'' @ error/delegate.c/InvokeDelegate/1924.
convert: unable to open file '/tmp/magick-D-NMEGWU_a0IypZWwTpYiWIE61nteoig': No such file or directory @ error/constitute.c/ReadImage/786.
convert: no images defined `b_480.webp' @ error/convert.c/ConvertImageCommand/3342.
```

### Images

_No response_
--- end body ---
