remove `XDeclaredButNotUsed` exclusion from Nim configurations (#5595)

* remove XDeclaredButNotUsed exclusion from Nim configurations

* copyright year linting

beacon_chain/nim.cfg

@@ -1,9 +1,15 @@
+# beacon_chain
+# Copyright (c) 2021-2023 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
 # Use only `secp256k1` public key cryptography as an identity in LibP2P.
 -d:"libp2p_pki_schemes=secp256k1"
 
 -d:chronosStrictException
 --styleCheck:usages
 --styleCheck:hint
---hint[XDeclaredButNotUsed]:off
 --hint[ConvFromXtoItselfNotNeeded]:off
 --hint[Processing]:off

ncli/nim.cfg

@@ -1,3 +1,10 @@
+# beacon_chain
+# Copyright (c) 2019-2023 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
 -u:metrics
 
 -d:"libp2p_pki_schemes=secp256k1"
@@ -5,6 +12,5 @@
 -d:chronosStrictException
 --styleCheck:usages
 --styleCheck:hint
---hint[XDeclaredButNotUsed]:off
 --hint[ConvFromXtoItselfNotNeeded]:off
 --hint[Processing]:off

tests/nim.cfg

@@ -11,6 +11,5 @@
 -d:chronosStrictException
 --styleCheck:usages
 --styleCheck:hint
---hint[XDeclaredButNotUsed]:off
 --hint[ConvFromXtoItselfNotNeeded]:off
 --hint[Processing]:off