Merge #17680: gitian: fixed SC2001 regex

c966ff1 gitian: fixed SC2001 regex (willyk)

Pull request description:

  Currently the gitian-win-signer.yml produces OUTFILE names without `-unsigned` stripped out
  This is due to regex having an`%` in front of it
  ```
  $ INFILE="bitcoin-0.19.0-win64-setup-unsigned.exe"
  $ echo "${INFILE/%-unsigned}"
  bitcoin-0.19.0-win64-setup-unsigned.exe
  $ echo "${INFILE/-unsigned}"
  bitcoin-0.19.0-win64-setup.exe
  ```

  Fixes #17361

ACKs for top commit:
  laanwj:
    ACK c966ff1
  hebasto:
    ACK c966ff1

Tree-SHA512: 954547f9dfa4cab4def5f284d4837c21f0e6fed7454a04e83e6b1b7d3fd3f9661ea657047f0d8162f6591909d32ef2f72e801b2f3a44cbb1131ac344cb913a69

Author: laanwj

contrib/gitian-descriptors/gitian-win-signer.yml

@@ -36,6 +36,6 @@ script: |
   make
   find ${UNSIGNED_DIR} -name "*-unsigned.exe" | while read i; do
     INFILE="$(basename "${i}")"
-    OUTFILE="${INFILE/%-unsigned}"
+    OUTFILE="${INFILE/-unsigned}"
     ./osslsigncode attach-signature -in "${i}" -out "${OUTDIR}/${OUTFILE}" -sigin "${SIGDIR}/${INFILE}.pem"
   done