Merge bitcoin/bitcoin#26319: add 0xb10c builder key

5165ae1 add 0xb10c builder key (0xb10c)

Pull request description:

  I've been asked to add my key given my [activity as GUIX builder](https://github.com/bitcoin-core/guix.sigs/commits?author=0xB10C).

ACKs for top commit:
  achow101:
    ACK 5165ae1
  1440000bytes:
    ACK bitcoin/bitcoin@5165ae1
  hebasto:
    ACK 5165ae1, the added fingerprint is the same as one in my local gpg output.

Tree-SHA512: 794b01c87dec5139cd9dd3a1ec7ca4dd21351b16b46a4ea64c3be0e569ff20a301cdfa45873663f446e0a59d6319950f77c32f776260cff63e176b81ed262be3

contrib/builder-keys/keys.txt

@@ -1,3 +1,4 @@
+982A193E3CE0EED535E09023188CBB2648416AD5 0xB10C (0xb10c)
 9D3CC86A72F8494342EA5FD10A41BDC3F4FAFF1C Aaron Clauson (sipsorcery)
 617C90010B3BD370B0AC7D424BB42E31C79111B8 Akira Takizawa (akx20000)
 E944AE667CF960B1004BC32FCA662BE18B877A60 Andreas Schildbach (aschildbach)