Bump pyjwt from 2.4.0 to 2.6.0 (#1897)

* Bump pyjwt from 2.4.0 to 2.6.0

Bumps [pyjwt](https://github.com/jpadilla/pyjwt) from 2.4.0 to 2.6.0.
- [Release notes](https://github.com/jpadilla/pyjwt/releases)
- [Changelog](https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/jpadilla/pyjwt/compare/2.4.0...2.6.0)

---
updated-dependencies:
- dependency-name: pyjwt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update pyjwt==2.6.0

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/jwt/jwk_set_cache.py

@@ -0,0 +1,32 @@
+import time
+from typing import Optional
+
+from .api_jwk import PyJWKSet, PyJWTSetWithTimestamp
+
+
+class JWKSetCache:
+    def __init__(self, lifespan: int):
+        self.jwk_set_with_timestamp: Optional[PyJWTSetWithTimestamp] = None
+        self.lifespan = lifespan
+
+    def put(self, jwk_set: PyJWKSet):
+        if jwk_set is not None:
+            self.jwk_set_with_timestamp = PyJWTSetWithTimestamp(jwk_set)
+        else:
+            # clear cache
+            self.jwk_set_with_timestamp = None
+
+    def get(self) -> Optional[PyJWKSet]:
+        if self.jwk_set_with_timestamp is None or self.is_expired():
+            return None
+
+        return self.jwk_set_with_timestamp.get_jwk_set()
+
+    def is_expired(self) -> bool:
+
+        return (
+            self.jwk_set_with_timestamp is not None
+            and self.lifespan > -1
+            and time.monotonic()
+            > self.jwk_set_with_timestamp.get_timestamp() + self.lifespan
+        )