fix(deps): update dependency pointycastle to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pointycastle	dependencies	major	^1.0.2 -> ^3.0.0

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Release Notes

bcgit/pc-dart

v3.7.0

• Added RC2
• Added RC4
• Added 3DES
• Added PKCS5S1ParameterGenerator
• Added PKCS12ParametersGenerator
• Added new OIDs
• Added new ASN1 models
• EAX
• Linting
• Fix to BasePadding

v3.6.2

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• Added OIDs 2.16.840.1.114412.1.1/digiCertOVCert and
• 2.23.140.1.2.2/organization-validated

v3.6.1

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• Added OID 2.5.4.26/registeredAddress
• Support ASN1 tag 164

v3.6.0

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• Added ECDH Basic Agreement
• Added ConcatKDF

v3.5.2

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• Added secp521r1 OID

v3.5.1

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• Added ASN1BMPString
• Added emailAddress OID

v3.5.0

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• RSAES-OAEP with SHA256 or any digest instance.
• Fixed bug in Keccak when updating with single bytes.

v3.4.0

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• Security update, fixed timing leaking in GCM implementation.
• Fixed bug in GCM counter.
• Added constant time gated xor.
• Removed more references to AESFastEngine.
• Security update, AESFastEngine is open to timing attacks, this has been deprecated and replaced with AESEngine.
• validateMac in BaseAEADBlockCipher is now constant time.

v3.3.5

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• New OID

v3.3.4

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• Performance update to scrypt
• SM3 implementation

v3.3.3

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• Argon2 in js environments.

v3.3.2

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• New OIDs

v3.3.1

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• Update to Register64 mul(...)
• New OID

v3.3.0

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• ECElGamal Encryptor and Decryptor

v3.2.0

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• Better ASN1 Dump
• New OIDs
• ASN1 Fixes

v3.1.3

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• Add Argon2
• Fix to ASN1 parsing, calculation of start position.

v3.1.2

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• Critical fixed to Blake2b and additional test vectors see https://github.com/bcgit/pc-dart/pull/108

v3.1.1

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• Updated pubspec

v3.0.1

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First non-nullable-by-default release

v2.0.1

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• Bug fix, ASN1Utils
• Removal of 'dart:io'
• RSAPrivateKey calculates the public exponent from the other values.

The previous BigInt handling functions in the util package now treat encoded BigInts as twos compliment numbers, this
may cause sudden unexpected failures if a number is suddenly negative. Users are advised to review their use of
decodeBigInt and encodeBigInt.

utils.dart:

• decodeBigInt is twos compliment.
• encodeBigInt is twos compliment and adds padding to preserve sign.
• encodeBigIntAsUnsigned writes the magnitude without any padding.
• decodeBigIntWithSign allows the specification of an arbitrary sign.
• Previous uses of decodeBigInt where the expectation is an unsigned integer have been updated with
  decodeBigIntWithSign(1, magnitude).

v2.0.0

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• No changes from 2.0.0-rc2

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