Bump symfony/http-kernel from 3.4.12 to 3.4.49

[dependabot[bot]]

Bumps symfony/http-kernel from 3.4.12 to 3.4.49.

Commits

• 5aa7240 Update VERSION for 3.4.49
• f351c07 Update VERSION for 3.4.48
• a98a4c3 Update VERSION for 3.4.47
• f5dfe19 Bump Symfony version to 3.4.47
• 09f8e3f Update VERSION for 3.4.46
• bd2d874 Fix transient tests
• e3512ba Remove branch-version (keep them for contracts only)
• d4483d4 Fix branch-version
• 4a3f2b7 Remove "version" from composer.json files, use "branch-version" instead
• 2934f07 Update versions in composer.json
• Additional commits viewable in compare view

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