build(deps): update rosell-dk/webp-convert requirement from ^1.1 to ^2.0

[dependabot-preview]

Updates the requirements on rosell-dk/webp-convert to permit the latest version.

Release notes

Sourced from rosell-dk/webp-convert's releases.

NOTE: API breaking change! (although minor)

NOTE: This release actually contains an api-breaking change!

• Environment variables are now now prefixed with "WEBPCONVERT_"

I decided not increasing major version because probably only few has started using this feature and I wish not increase major version this soon after 2.0.

The release also contains these fixes:

• Fixed CwebP Error: Unknown option '-near_lossless' for older versions…
• Update the precompiled cwebp for linux (0.6.1 -> 1.0.2).

And this feature:

• Besides using environment variables for sensitive information (ie WEBPCONVERT_CWEBP_PATH), you can now also use constants (with same name)

Commits

• 3a2c6ab This one also goes out for Scrutinizer
• 583657e removed dead variable
• 6f3e756 This one goes out for Scrutinizer
• 3d6fff7 does Scrutinizer complain if we use constant() instead ?
• 5af5359 fixed test?
• 4c13355 Environment variables are now now prefixed with "WEBPCONVERT_". Also, now we ...
• c672b41 Update the precompiled cwebp for linux (0.6.1 -> 1.0.2). #192
• a581ba5 Fixed CwebP Error: Unknown option '-near_lossless' for older versions of cweb...
• 50f59ca Pass on encoding:auto to WPC for api=2. Closes #168
• 8298cf1 Now checks that "options" key exists. Closes #190.
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 19

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-3.0%) to 64.179%

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Files with Coverage Reduction	New Missed Lines	%
src/Service/ImagingService.php	2	84.31%

Totals
Change from base Build 13:	-3.0%
Covered Lines:	43
Relevant Lines:	67

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💛 - Coveralls

[dependabot-preview]

Superseded by #4.