remove HEAD arraymancer dependency requirement in package CI

Was introduced to handle a break in nim-lang#23392, according to nim-lang#23503 (comment) should not be needed anymore

testament/important_packages.nim

@@ -60,7 +60,7 @@ pkg "compactdict"
 pkg "comprehension", "nimble test", "https://github.com/alehander92/comprehension"
 pkg "cowstrings"
 pkg "criterion", allowFailure = true # needs testing binary
-pkg "datamancer", "nimble install -y arraymancer@#HEAD; nimble test"
+pkg "datamancer"
 pkg "dashing", "nim c tests/functional.nim"
 pkg "delaunay"
 pkg "docopt"
@@ -72,7 +72,7 @@ pkg "fragments", "nim c -r fragments/dsl.nim", allowFailure = true # pending htt
 pkg "fusion"
 pkg "gara"
 pkg "glob"
-pkg "ggplotnim", "nimble install -y arraymancer@#HEAD; nim c -d:noCairo -r tests/tests.nim"
+pkg "ggplotnim", "nim c -d:noCairo -r tests/tests.nim"
 pkg "gittyup", "nimble test", "https://github.com/disruptek/gittyup", allowFailure = true
 pkg "gnuplot", "nim c gnuplot.nim"
 # pkg "gram", "nim c -r --mm:arc --define:danger tests/test.nim", "https://github.com/disruptek/gram"
@@ -125,7 +125,7 @@ pkg "nimx", "nim c test/main.nim", allowFailure = true
 pkg "nitter", "nim c src/nitter.nim", "https://github.com/zedeus/nitter"
 pkg "norm", "testament r tests/common/tmodel.nim"
 pkg "npeg", "nimble testarc"
-pkg "numericalnim", "nimble install -y arraymancer@#HEAD; nimble nimCI"
+pkg "numericalnim", "nimble nimCI"
 pkg "optionsutils"
 pkg "ormin", "nim c -o:orminn ormin.nim"
 pkg "parsetoml"