[chore]: Bump github.com/SherClockHolmes/webpush-go from 1.3.0 to 1.4.0 (#3694)

Bumps [github.com/SherClockHolmes/webpush-go](https://github.com/SherClockHolmes/webpush-go) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/SherClockHolmes/webpush-go/releases)
- [Commits](https://github.com/SherClockHolmes/webpush-go/compare/v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: github.com/SherClockHolmes/webpush-go
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

vendor/github.com/golang-jwt/jwt/v5/signing_method.go

@@ -0,0 +1,49 @@
+package jwt
+
+import (
+	"sync"
+)
+
+var signingMethods = map[string]func() SigningMethod{}
+var signingMethodLock = new(sync.RWMutex)
+
+// SigningMethod can be used add new methods for signing or verifying tokens. It
+// takes a decoded signature as an input in the Verify function and produces a
+// signature in Sign. The signature is then usually base64 encoded as part of a
+// JWT.
+type SigningMethod interface {
+	Verify(signingString string, sig []byte, key interface{}) error // Returns nil if signature is valid
+	Sign(signingString string, key interface{}) ([]byte, error)     // Returns signature or error
+	Alg() string                                                    // returns the alg identifier for this method (example: 'HS256')
+}
+
+// RegisterSigningMethod registers the "alg" name and a factory function for signing method.
+// This is typically done during init() in the method's implementation
+func RegisterSigningMethod(alg string, f func() SigningMethod) {
+	signingMethodLock.Lock()
+	defer signingMethodLock.Unlock()
+
+	signingMethods[alg] = f
+}
+
+// GetSigningMethod retrieves a signing method from an "alg" string
+func GetSigningMethod(alg string) (method SigningMethod) {
+	signingMethodLock.RLock()
+	defer signingMethodLock.RUnlock()
+
+	if methodF, ok := signingMethods[alg]; ok {
+		method = methodF()
+	}
+	return
+}
+
+// GetAlgorithms returns a list of registered "alg" names
+func GetAlgorithms() (algs []string) {
+	signingMethodLock.RLock()
+	defer signingMethodLock.RUnlock()
+
+	for alg := range signingMethods {
+		algs = append(algs, alg)
+	}
+	return
+}