Update fgrosse/phpasn1 requirement from ^2.0 to ^2.4

[dependabot]

Updates the requirements on fgrosse/phpasn1 to permit the latest version.

Release notes

Sourced from fgrosse/phpasn1's releases.

v2.4.0

Drop support for PHP 7.0 (#89)

Changelog

Sourced from fgrosse/phpasn1's changelog.

v2.4.0 (2021-12)

• Drop support for PHP 7.0 #89

v2.3.1 (2021-12)

• Add #[\ReturnTypeWillChange] attributes for PHP 8.1 compatibility #87

v2.3.0 (2021-04)

• Allow creating an unsigned CSR and adding the signature later #82

v2.2.0 (2020-08)

• support polyfills for bcmath and gmp, and add a composer.json suggestion for the phpseclib/bcmath_polyfill for servers unable to install PHP the gmp or bcmath extensions.

v.2.1.1 & &v.2.0.2 (2018-12)

• add stricter validation around some structures, highlighed by wycheproof test suite

v.2.1.0 (2018-03)

• add support for bcmath extension (making gmp optional) #68

v.2.0.1 & v.1.5.3 (2017-12)

• add .gitattributes file to prevent examples and tests to be installed via composer when --prefer-dist was set

v.2.0.0 (2017-08)

• rename FG\ASN1\Object to FG\ASN1\ASNObject because Object is a special class name in the next major PHP release
  • when you upgrade you have to adapt all corresponding use and extends statements as well as type hints and all usages of Object::fromBinary(…).
• generally drop PHP 5.6 support

v.1.5.2 (2016-10-29)

• allow empty octet strings

v.1.5.1 (2015-10-02)

• add keywords to composer.json (this is a version on its own so the keywords are found on a stable version at packagist.org)

v.1.5.0 (2015-10-30)

• fix a bug that would prevent you from decoding context specific tags on multiple objects #57
  • ExplicitlyTaggedObject::__construct does now accept multiple objects to be tagged with a single tag
  • ExplicitlyTaggedObject::getContent will now always return an array (even if only one object is tagged)

v.1.4.2 (2015-09-29)

• fix a bug that would prevent you from decoding empty tagged objects #57

v.1.4.1

• improve exception messages and general error handling [Apply fixes from StyleCI #55](https ://github-redirect.dependabot.com/test for invalid input fgrosse/PHPASN1#55)

v.1.4.0

• require PHP 5.6
• support big integers (closes #1 and #37)

... (truncated)

Commits

• eef4889 Update CHANGELOG.md
• 2bb74f1 Merge pull request #89 from TimWolla/ci
• 623b29e Run CI for PHP 8.1
• fe64d36 Run CI for PHP 8.0
• e58b18a Allow PHPUnit 8.0
• 7ed3e85 add : void to setup and teardown for PHPUnit8 compatibility
• b799153 Drop support for PHP 7.0
• b6f14ab Use safe PHP version constraints in composer.json
• 6edcecb Update build status badge
• a7ab1eb Update CHANGELOG.md
• Additional commits viewable in compare view

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