perf: autobump bio/unicycler (#636)

Automatic update of bio/unicycler.

Co-authored-by: snakedeploy-bot[bot] <115615832+snakedeploy-bot[bot]@users.noreply.github.com>

bio/unicycler/environment.yaml

@@ -3,11 +3,11 @@ channels:
   - bioconda
   - nodefaults
 dependencies:
-  - bowtie2 ==2.4.1
-  - bcftools ==1.10.2
-  - spades ==3.14.1
-  - samtools ==1.10
-  - pilon ==1.23
-  - racon ==1.4.13
-  - blast ==2.10.1
-  - unicycler ==0.4.8 
+  - bowtie2 =2.4.5
+  - bcftools =1.16
+  - spades =3.15.5
+  - samtools =1.16.1
+  - pilon =1.24
+  - racon =1.5.0
+  - blast =2.13.0
+  - unicycler =0.5.0