Update symfony/class-loader requirement from ^2.0 to ^3.4

[dependabot]

Updates the requirements on symfony/class-loader to permit the latest version.

Release notes

Sourced from symfony/class-loader's releases.

v3.4.47

Changelog (symfony/class-loader@v3.4.46...v3.4.47)

• no changes

Changelog

Sourced from symfony/class-loader's changelog.

CHANGELOG

3.3.0

• deprecated the component: use Composer instead

3.0.0

• The DebugClassLoader class has been removed
• The DebugUniversalClassLoader class has been removed
• The UniversalClassLoader class has been removed
• The ApcUniversalClassLoader class has been removed

2.4.0

• deprecated the UniversalClassLoader in favor of the ClassLoader class instead
• deprecated the ApcUniversalClassLoader in favor of the ApcClassLoader class instead
• deprecated the DebugUniversalClassLoader in favor of the DebugClassLoader class from the Debug component
• deprecated the DebugClassLoader as it has been moved to the Debug component instead

2.3.0

• added a WinCacheClassLoader for WinCache

2.1.0

• added a DebugClassLoader able to wrap any autoloader providing a findFile method
• added a new ApcClassLoader and XcacheClassLoader using composition to wrap other loaders
• added a new ClassLoader which does not distinguish between namespaced and pear-like classes (as the PEAR convention is a subset of PSR-0) and supports using Composer's namespace maps
• added a class map generator
• added support for loading globally-installed PEAR packages

Commits

• a22265a Remove branch-version (keep them for contracts only)
• df12a49 Fix branch-version
• 30ec6eb Remove "version" from composer.json files, use "branch-version" instead
• 4afd812 Update versions in composer.json
• 1709240 Remove "branch-alias", populate "version"
• 5e119b7 Enable "native_constant_invocation" CS rule
• 04a7e4c [ClassLoader][Routing] Fix namespace parsing on php 8.
• e4636a4 Add missing dots at the end of exception messages
• bcdf6ff Update links to documentation
• a016c36 Update year in license files
• Additional commits viewable in compare view

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