Update slim/psr7 requirement from ^1.0 to ^1.1

[dependabot-preview]

Updates the requirements on slim/psr7 to permit the latest version.

Release notes

Sourced from slim/psr7's releases.

1.1.0

Total issues resolved: 5

• 143: Use canonical phpdoc @var ordering thanks to @andrew-demb
• 148: Fix the default port if not defined (for https) thanks to @adriansuter
• 150: Patch cookies get() method in case a value is null thanks to @adriansuter
• 151: Fix Authorization Headers thanks to @adriansuter
• 154: Fix Fstat() assertion thanks to @l0gicgate

Commits

• 3c76899 Merge pull request #154 from l0gicgate/FixFstatBoolBug
• ac8ef9c add use function statement for is_array
• 9b51716 fix condition to ensure fstat() returned value is an array
• 316ff1c Merge pull request #151 from adriansuter/patch-response-headers
• 3ae1689 Fix Authorization Headers
• 1f8bb50 Merge pull request #150 from adriansuter/patch-cookie-defaults
• 99ea72c Fix isset is false if value is null
• b285c52 Add cookie test for get using default value
• e4be5e0 Merge pull request #148 from adriansuter/patch-https-port
• 991ae75 Fix the default port if not defined for https
• Additional commits viewable in compare view

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