Update symfony/dotenv requirement from ^6.0 to ^8.0

[dependabot]

Updates the requirements on symfony/dotenv to permit the latest version.

Release notes

Sourced from symfony/dotenv's releases.

v8.0.7

Changelog (symfony/dotenv@v8.0.6...v8.0.7)

• bug #63496 Defer variable and command expansion to account for overrides from subsequent .env files (@​nicolas-grekas)

Changelog

Sourced from symfony/dotenv's changelog.

CHANGELOG

8.0

• Remove $defaultName and $defaultDescription properties from DebugCommand command, configuration is done through the #[AsCommand] attribute

7.1

• Add SYMFONY_DOTENV_PATH variable with the path to the .env file loaded by Dotenv::loadEnv() or Dotenv::bootEnv()

6.2

• Add a new filter argument to debug:dotenv command to filter variable names

5.4

• Add dotenv:dump command to compile the contents of the .env files into a PHP-optimized file called .env.local.php
• Add debug:dotenv command to list all dotenv files with variables and values
• Add $overrideExistingVars on Dotenv::bootEnv() and Dotenv::loadEnv()

5.1.0

• added Dotenv::bootEnv() to check for .env.local.php before calling Dotenv::loadEnv()
• added Dotenv::setProdEnvs() and Dotenv::usePutenv()
• made Dotenv's constructor accept $envKey and $debugKey arguments, to define the name of the env vars that configure the env name and debug settings
• deprecated passing $usePutenv argument to Dotenv's constructor

5.0.0

• using putenv() is disabled by default

4.3.0

• deprecated use of putenv() by default. This feature will be opted-in with a constructor argument to Dotenv

4.2.0

• added Dotenv::overload() and $overrideExistingVars as optional parameter of Dotenv::populate()
• added Dotenv::loadEnv() to load a .env file and its corresponding .env.local, .env.$env and .env.$env.local files if they exist

... (truncated)

Commits

• 23bd13c Merge branch '7.4' into 8.0
• 7e5529a Merge branch '6.4' into 7.4
• 148138e [Dotenv] Defer variable and command expansion to account for overrides from s...
• 94d5976 Merge branch '7.4' into 8.0
• db37425 [Dotenv] Windows-related tweak
• 874cc67 [Dotenv] Use APP_RUNTIME_OPTIONS variable when dumping dotenv
• 460b406 Merge branch '7.4' into 8.0
• 1658a4d Merge branch '7.3' into 7.4
• 8c53fef Merge branch '6.4' into 7.3
• 924edbc [Dotenv] DotenvDumpCommand cannot be internal
• Additional commits viewable in compare view

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