test(solidity): upgrade pragma

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "lib/v3-periphery"]
 	path = lib/v3-periphery
 	url = https://github.com/uniswap/v3-periphery
+[submodule "lib/solady"]
+	path = lib/solady
+	url = https://github.com/Vectorized/solady

foundry.toml

@@ -1,5 +1,5 @@
 [profile.default]
-solc_version = '0.8.25'
+solc_version = '0.8.26'
 src = 'src'
 out = 'out'
 libs = ['lib']
@@ -160,7 +160,7 @@ yul = true
 stackAllocation = true
 # ACHTUNG! Setting this is extremely dangerous
 # {@see {@link https://soliditylang.org/blog/2023/07/19/full-inliner-non-expression-split-argument-evaluation-order-bug/} }
-# optimizerSteps = 'u:'
+optimizerSteps = 'jmul[jul] VcTOcul jmul'
 
 # [default.model_checker]
 # contracts = { '/path/to/project/src/Contract.sol' = [ 'Contract' ] }