[BUGFIX] Declare guzzlehttp/psr7 dependency

guzzlehttp/psr7 is not only an indirect dependency
from guzzlehttp/guzzle, but also a direct core
dependency since we extend LazyOpenStream in
SelfEmittableLazyOpenStream. Declare that dependency
directly, which also blocks upcoming guzzlehttp/psr7:2.0
which is currently incompatible with our core use.

composer req guzzlehttp/psr7:^1.4.0 --no-update
composer req guzzlehttp/psr7:^1.4.0 -d typo3/sysext/core --no-update
composer update --lock

Change-Id: I4968bc854545262ce0230ea71647463f5a332f54
Resolves: #94422
Releases: master, 10.4, 9.5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69667
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

composer.json

@@ -45,6 +45,7 @@
 		"doctrine/lexer": "^1.0",
 		"egulias/email-validator": "^2.1",
 		"guzzlehttp/guzzle": "^6.3.0",
+		"guzzlehttp/psr7": "^1.4.0",
 		"nikic/php-parser": "^4.10.4",
 		"phpdocumentor/reflection-docblock": "^5.2",
 		"phpdocumentor/type-resolver": "^1.3",

typo3/sysext/core/composer.json

@@ -33,6 +33,7 @@
 		"doctrine/lexer": "^1.0",
 		"egulias/email-validator": "^2.1",
 		"guzzlehttp/guzzle": "^6.3.0",
+		"guzzlehttp/psr7": "^1.4.0",
 		"nikic/php-parser": "^4.10.4",
 		"psr/container": "^1.0",
 		"psr/event-dispatcher": "^1.0",