Update GPG Key to [email protected] (#856)

Fix 'Install with Package Managers' section by referencing the new [email protected] key
Regenerate llms.txt

Author: deigenvektor

infrastructure/running-a-validator/onboarding-and-offboarding/set-up-validator.md

@@ -140,9 +140,9 @@ Users running Debian-based distributions like Ubuntu can install the binaries us
 Execute the following commands as root to add the official repository and install the binaries:
 
 ```bash
-# Import the security@parity.io GPG key
-gpg --recv-keys --keyserver hkps://keys.mailvelope.com 9D4B2B6EB8F97156D19669A9FF0812D491B96798
-gpg --export 9D4B2B6EB8F97156D19669A9FF0812D491B96798 > /usr/share/keyrings/parity.gpg
+# Import the release-team@parity.io GPG key
+gpg --keyserver hkps://keyserver.ubuntu.com --receive-keys 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE
+gpg --export 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE > /usr/share/keyrings/parity.gpg
 
 # Add the Parity repository and update the package index
 echo 'deb [signed-by=/usr/share/keyrings/parity.gpg] https://releases.parity.io/deb release main' > /etc/apt/sources.list.d/parity.list
@@ -202,4 +202,4 @@ Once the Polkadot binaries are installed, it's essential to verify that everythi
     echo $PATH
     ```
 
-    If necessary, you can move the binaries to a shared location, such as `/usr/local/bin/`, and add it to your `$PATH`.
+    If necessary, you can move the binaries to a shared location, such as `/usr/local/bin/`, and add it to your `$PATH`.

llms.txt

@@ -20008,9 +20008,9 @@ Users running Debian-based distributions like Ubuntu can install the binaries us
 Execute the following commands as root to add the official repository and install the binaries:
 
 ```bash
-# Import the security@parity.io GPG key
-gpg --recv-keys --keyserver hkps://keys.mailvelope.com 9D4B2B6EB8F97156D19669A9FF0812D491B96798
-gpg --export 9D4B2B6EB8F97156D19669A9FF0812D491B96798 > /usr/share/keyrings/parity.gpg
+# Import the release-team@parity.io GPG key
+gpg --keyserver hkps://keyserver.ubuntu.com --receive-keys 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE
+gpg --export 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE > /usr/share/keyrings/parity.gpg
 
 # Add the Parity repository and update the package index
 echo 'deb [signed-by=/usr/share/keyrings/parity.gpg] https://releases.parity.io/deb release main' > /etc/apt/sources.list.d/parity.list