Update slim/slim requirement from ^4.0 to ^4.5

[dependabot-preview]

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

Release notes

Sourced from slim/slim's releases.

4.5.0

Release Notes

Feedback Thread

Changelog

Sourced from slim/slim's changelog.

4.5.0 - 2020-04-14

Added

• 2928 Test against PHP 7.4
• 2937 Add support for PSR-3

Fixed

• 2916 Rename phpcs.xml to phpcs.xml.dist
• 2917 Update .editorconfig
• 2925 ResponseEmitter: Don't remove Content-Type and Content-Length when body is empt
• 2932 Update the Tidelift enterprise language
• 2938 Modify usage of deprecated expectExceptionMessageRegExp() method

4.4.0 - 2020-01-04

Added

• 2862 Optionally handle subclasses of exceptions in custom error handler
• 2869 php-di/php-di added in composer suggestion
• 2874 Add null to param type-hints
• 2889 Make RouteContext attributes customizable and change default to use private names
• 2907 Migrate to PSR-12 convention
• 2910 Migrate Zend to Laminas
• 2912 Add Laminas PSR17 Factory
• 2913 Update php-autoload-override version
• 2914 Added ability to add handled exceptions as an array

Fixed

• 2864 Optimize error message in error handling if displayErrorDetails was not set
• 2876 Update links from http to https
• 2877 Fix docblock for Slim\Routing\RouteCollector::cacheFile
• 2878 check body is writable only on ouput buffering append
• 2896 Render errors uniformly
• 2902 Fix prophecies
• 2908 Use autoload-dev for Slim\Tests namespace

Removed

• 2871 Remove explicit type-hint
• 2872 Remove type-hint

4.3.0 - 2019-10-05

Added

• 2819 Added description to addRoutingMiddleware()
• 2820 Update link to homepage in composer.json
• 2828 Allow URIs with leading multi-slashes
• 2832 Refactor FastRouteDispatcher
• 2835 Rename pathFor to urlFor in docblock
• 2846 Correcting the branch name as per issue-2843
• 2849 Create class alias for FastRoute\RouteCollector
• 2855 Add list of allowed methods to HttpMethodNotAllowedException

... (truncated)

Commits

• 5613cbb Merge pull request #2939 from l0gicgate/4.5-Release
• 82a19f7 bump up version constant to 4.5.0
• 3a8654d add 4.5.0 milestone entries
• d80402b Merge pull request #2938 from elazar/chore/phpunit-9
• b34a9d4 Merge branch '4.x' into chore/phpunit-9
• eeb0947 Use correct assertion methods
• 1acba18 Remove use of PHPUnit 9
• 8245b0a Merge pull request #2937 from elazar/feature/psr-log
• 40eebcd Move exception FQCN to use directive in Logger
• 040a831 Address PR comments
• Additional commits viewable in compare view

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